Discoid Roaches vs. Other Feeders: Building the Best Leopard Gecko Diet

I've kept leopard geckos and bred their feeders for years, and if there's one thing I wish every new keeper understood on day one, it's this: you are not feeding your gecko — you're feeding whatever your feeders ate. A leopard gecko is only as healthy as the insects you put in front of it, and those insects are only as nutritious as the diet they got before they became dinner. Get that chain right and a leopard gecko is one of the most forgiving, long-lived reptiles you can keep — 15 to 20 years is normal. Get it wrong and you're looking at metabolic bone disease, obesity, or a slow decline that's entirely preventable.

This is the complete diet guide. I'll walk through why nutrition matters for an insectivore, lay out every common feeder with honest numbers, compare discoid roaches head-to-head against crickets, mealworms, dubia, and the treat worms, and then get concrete about sizing, schedules, gut-loading, supplementation, and the myths that get geckos hurt. Read it once end to end and you'll be able to build a feeding routine that actually works — and fix one that isn't.

One correction up front, because the original version of this article (and half the internet) gets it wrong: discoid roaches are Blaberus discoidalis, not Blaptica dubia. Blaptica dubia is the dubia roach — a different species. They're cousins in the same family and they're nutritionally similar, but they are not the same animal, and I'm going to keep them straight throughout. I'll also push back on the common "discoids have a great calcium ratio" claim, because they don't — almost no feeder does, and pretending otherwise is how geckos end up calcium-deficient.

Why a leopard gecko's diet matters more than almost anything else

Leopard geckos are strict insectivores. In the wild, across the rocky scrub of Afghanistan, Pakistan, and northwest India, they eat live invertebrates — beetles, spiders, crickets, the occasional small scorpion — and that's it. No fruit, no veg, no pellets. Their entire physiology is built around catching and digesting whole prey. The University of Michigan's Animal Diversity Web entry on Eublepharis macularius describes them as nocturnal, ground-dwelling insectivores, and that single fact drives everything in this guide: their nutrition has to come from insects, which means the insects have to carry the load.

A balanced diet supports three things that go wrong fast when it's off:

• ◆

  Bone health. Leopard geckos need a steady supply of calcium, and crucially they need more calcium than phosphorus in their overall intake. The problem is that insects are naturally backwards on this — they carry far more phosphorus than calcium. Without supplementation, a gecko slowly pulls calcium out of its own skeleton to function, and you get metabolic bone disease (MBD): rubbery jaw, kinked spine, tremors, weak limbs. It's common, it's crippling, and it is almost entirely a husbandry failure. The Merck Veterinary Manual covers MBD (nutritional secondary hyperparathyroidism) as one of the most frequent reptile diseases seen in practice, and in leopard geckos it's nearly always a calcium-and-D3 problem.

• ◆

  Body condition. Leopard geckos store fat in their tails — a healthy adult has a tail roughly as wide as its neck or wider. But the same fat-storing biology means they get obese easily on rich feeders. Fatty liver disease (hepatic lipidosis) follows a diet of too many waxworms and mealworms. Lean staple, treats in moderation.

• ◆

  Growth and immunity. Hatchlings and juveniles are building a body fast and need frequent, high-protein meals. Skimp here and you stunt growth and weaken the immune system. Overdo the fat and you get a chunky juvenile with the same liver risk as an over-fed adult.

The two levers you control are what the feeder ate (gut-loading) and what you dust on the feeder (supplementation). Pick the right feeder, load it properly, dust it correctly, and you've covered the overwhelming majority of leopard gecko nutrition. The rest of this guide is the detail behind those three moves.

The common feeder insects, honestly assessed

Before the head-to-head comparisons, here's the cast of characters. Each feeder has a job; the mistake is treating a treat like a staple or a staple like a treat.

Crickets

Crickets are the default feeder for a reason: cheap, available everywhere, and they move in the jerky, twitchy way that triggers a leopard gecko's hunting strike. Nutritionally they're a solid moderate staple — roughly 17–21% protein, low fat (around 3–5%), high moisture. They gut-load well, so what you feed them reaches your gecko.

The downsides are practical, not nutritional. They smell. They chirp at 2 a.m. They escape — and an uneaten cricket left in the enclosure will actually bite a sleeping or shedding gecko. They also die fast in storage, so you're restocking constantly. If you're fine managing that, crickets are a perfectly legitimate staple.

Mealworms

Mealworms (Tenebrio molitor larvae) are the convenience feeder: store them in the fridge, they go dormant, they last weeks. They're non-aggressive and easy to handle. But they're moderate protein and notably higher in fat, and they carry a hard chitinous exoskeleton that's tougher to digest — a real concern for hatchlings and small juveniles. As an occasional part of a varied diet, fine. As a sole staple, they tilt a gecko toward obesity and give the least digestible meal of the common options.

Dubia roaches (Blaptica dubia)

The actual Blaptica dubia. Dubia are one of the best feeders, period: high protein (around 20–23%), moderate fat, soft low-chitin bodies that digest cleanly, slow-moving and easy for a gecko to catch, silent, low-odor, and they can't climb smooth walls so escapees stay in a bin. They breed readily in captivity. The main catch is legality — dubia are restricted in Florida — which is a big part of why discoids exist as a feeder at all.

Discoid roaches (Blaberus discoidalis)

The subject of this guide, and the dubia stand-in. Discoids are a tropical Central/South American roach, adults reaching about 1.5–2 inches, oval and flat and dark brown, with smaller lighter nymphs perfect for younger geckos. They share dubia's best traits: high protein (around 20%), moderate fat, soft low-chitin bodies that are easy to digest, near-silent, low-odor, and — importantly — they cannot climb smooth vertical surfaces like glass or smooth plastic. The big advantage over dubia is legality: discoids are an accepted feeder in Florida where dubia are banned, which makes them the practical roach for a huge number of US keepers. The honest trade-offs: they breed a bit slower than dubia and they genuinely demand warmth to reproduce.

Superworms

Superworms (Zophobas morio larvae) are bigger, wrigglier mealworm-like larvae that put on a great show for a movement-driven hunter. But the numbers are a warning: roughly 19% protein and a hefty ~17% fat, plus a hard head capsule and tough skin. They're a treat and a variety feeder for adults, not a staple — lean on them and you're feeding fatty liver disease.

Waxworms

Waxworms are candy. Soft, pale, and extremely fatty — on the order of 20%+ fat — leopard geckos love them and will happily refuse better food to hold out for more. Their job is narrow and real: putting weight on a thin, sick, or recovering gecko, or an occasional indulgence. Feed them routinely and you get obesity and a picky eater.

Hornworms (and BSFL, the calcium exception)

Hornworms (Manduca larvae, sometimes sold as goliath worms) are the hydration feeder — around 85% moisture, low fat (~3%), modest protein (~9%). They're fantastic for a gecko that's dehydrated, constipated, or in a dry spell, and they grow fast so feed them promptly. They can't carry a diet on 9% protein, but as a juicy treat they're excellent.

Black soldier fly larvae (BSFL) deserve a special mention because they're the one genuine exception to the calcium rule. Most feeders are phosphorus-heavy; BSFL naturally carry a good calcium-to-phosphorus ratio, which means they're the rare feeder you don't necessarily have to dust. They're a great rotational feeder for exactly that reason.

What discoid roaches actually are (and the myth to drop)

Let me set the record straight on discoids, because the source material this guide improves on had two real errors worth correcting.

Error one: the name. Discoid roaches are Blaberus discoidalis. They are not Blaptica dubia. That's the dubia roach. Both belong to the family Blaberidae, both are live-bearing tropical roaches, and both make excellent feeders — but they're distinct species. If a care sheet calls a discoid "Blaptica dubia," it copied the error from somewhere else.

Error two: the calcium claim. You'll constantly read that discoids have a "favorable calcium-to-phosphorus ratio" — sometimes a specific-sounding number like 1:1.5. This is wrong and it's dangerous, because it tells keepers they can skip dusting. The truth: discoids, like nearly every feeder insect, are phosphorus-heavy. They carry substantially more phosphorus than calcium. A roughly 1:1 or better ratio is what a reptile needs, and feeder insects generally come in somewhere around 1:3 to 1:8 the wrong way. Gut-loading with calcium-rich greens nudges it, but it does not flip it. You dust discoids with calcium. Full stop. (The only common feeder you can semi-reliably skip dusting is BSFL.)

With those corrected, here's why discoids are genuinely a top-tier feeder:

• ◆High protein, moderate fat, soft body. Around 20% protein with moderate fat and a low-chitin exoskeleton means a nutritious meal that's easy to digest across every life stage, hatchling to adult. The low chitin specifically lowers impaction risk versus mealworms or superworms.
• ◆They don't climb smooth walls, don't fly, barely smell. A loose discoid stays in a smooth bin or feeding cup. There's no cricket-chirp, no cricket-stink. Households sensitive to the smell and noise of crickets vastly prefer them.
• ◆They gut-load and hold nutrients well. Feed a discoid well for 24–48 hours and it stays a nutrient package longer than a cricket, which has a faster gut transit.
• ◆Legality where dubia are banned. This is the headline reason discoids exist in the trade. In Florida especially, where dubia are restricted, discoids are the accepted soft-bodied roach feeder.
• ◆Sustainable and breedable at home. Hardy, modest food needs, and they reproduce in captivity, so you can grow your own staple supply instead of buying every week.

If you want to start or top up a colony, All Angles Creatures stocks healthy, well-started discoid roaches sized for both breeding stock and direct feeding — and if you want to actually keep that colony producing, I wrote a full breeding playbook (linked at the bottom).

The master comparison table

Here's how the common leopard gecko feeders stack up. Treat these as approximate, as-fed figures — real values swing with diet, life stage, and source — but the relationships are reliable, and the relationships are what should drive your choices. Note that every feeder except BSFL is phosphorus-heavy and needs calcium dusting.

The pattern to read off that table:

• ◆Roaches (discoid and dubia) and crickets are the staple zone — enough protein, controlled fat, digestible. Build the diet's backbone here.
• ◆Mealworms, superworms, and waxworms are the high-fat zone — fine occasionally, dangerous as staples.
• ◆Hornworms are the water zone — great for hydration, useless as a foundation.
• ◆BSFL are the calcium zone — the one feeder that fixes rather than worsens the calcium problem.

Discoid roaches vs. crickets

This is the comparison most new keepers are actually making, because crickets are what the pet store hands you.

Protein: Discoids win slightly — ~20% vs. crickets' ~17–21%. Both are adequate; discoids run a touch richer and steadier.

Fat: Roughly comparable. Crickets are a hair leaner, which can be a small advantage for an obesity-prone adult, but neither is a fatty feeder, so this rarely decides anything.

Digestibility: Discoids win. Their soft, low-chitin bodies are gentler on a gecko's gut than a cricket's tougher shell — meaningful for hatchlings and juveniles.

Movement and feeding response: Crickets win for movement-driven geckos. That frantic cricket scramble triggers strikes reliably. Discoids move deliberately, and a gecko that hunts purely by motion may ignore a calm roach — you sometimes have to wiggle it with tongs. For a gecko that strikes fine either way, the discoid's slower pace means it isn't running off to hide in a cork-bark crevice.

Maintenance and quality of life: Discoids win, decisively. No chirping, almost no smell, they don't escape across the room, and they live for months instead of dying off in a week. Crickets are loud, smelly, short-lived, and a loose one can bite your gecko. If you've ever had a cricket bin crash and stink up a room, you know.

Cost and availability: Crickets win on both — cheaper and stocked everywhere. Discoids cost more per bug and may need ordering online, but if you breed them, your per-feeder cost drops toward zero.

My take: For pure husbandry quality, discoids are the better feeder. For sheer convenience and trigger-happy feeding response on a budget, crickets hold their own. Plenty of keepers run discoids as the staple and keep a few crickets around for variety and to spark a sluggish eater.

Discoid roaches vs. mealworms

Nutrition: Discoids win clearly. Comparable-to-higher protein, and crucially much lower fat — mealworms run around 13% fat versus discoids' ~6–7%. A mealworm-heavy diet is a classic route to an overweight gecko.

Digestion: Discoids win, and this one matters. Mealworms have a hard chitinous exoskeleton that's tougher to break down, especially for young or small geckos; the soft discoid is far easier on the gut and lower-risk for impaction.

Movement: Roughly a wash. Mealworms wiggle in place but don't travel; discoids walk deliberately. Neither is a frantic mover. A mealworm sitting in a dish can be ignored entirely, which is why people use feeding dishes for them.

Convenience and storage: Mealworms win. Fridge storage puts them in dormancy for weeks with near-zero care. Discoids need a warm bin and ongoing (if light) maintenance. If "throw them in the fridge and forget it" is the priority, mealworms are simpler.

Sizing: Discoids win on range — nymph to adult covers hatchling to adult geckos. Mealworms come in fewer practical sizes.

My take: Nutritionally and digestively discoids beat mealworms across the board. Mealworms earn their place only on storage convenience and as an occasional variety item — never as the everyday staple a lot of beginners accidentally make them.

Dubia roaches vs. discoid roaches: which roach?

Since these two are the premier soft-bodied roach feeders and constantly confused, here's the straight head-to-head.

Nutrition: Effectively a tie. Both run ~20% protein with moderate fat and soft, easily digested bodies. Discoids often edge slightly higher on protein, dubia slightly higher on fat, but the difference is trivial for a gecko. Treat them as nutritionally interchangeable.

Legality: Discoids win where it counts. Dubia are banned in Florida; discoids are accepted there. If you're in Florida (or anywhere dubia are restricted), the choice is made for you. Always confirm your own state and local rules before ordering — these lists change. A reliable non-commercial place to start is your state agriculture department or land-grant university extension service.

Breeding speed: Dubia win. They mature and reproduce somewhat faster, so a dubia colony ramps to harvest sooner. Discoids breed at a more measured pace and demand warmth.

Containment: Tie. Neither adult climbs smooth vertical walls, so both stay in a smooth bin.

Smell and noise: Tie — both are low-odor and silent, a huge upgrade over crickets.

Size and handling: Comparable, discoids often running a touch larger as adults; both are slow and easy to handle and to catch.

My rule of thumb: In dubia-legal areas, either is excellent — pick on price and availability. In dubia-restricted areas (Florida especially), discoids are the obvious choice and give up almost nothing. For a deeper dive on this exact question I keep a dedicated comparison (linked at the end).

Waxworms, hornworms, and superworms: the treat tier

These three get grouped because they share a job: variety and special-purpose use, never the foundation.

Waxworms

High-fat candy — 20%+ fat. Soft, pale, irresistible. Use them to put weight on a thin, sick, or recovering gecko, or as a rare indulgence. The danger is twofold: routine feeding causes obesity and fatty liver, and geckos will get hooked and refuse better food holding out for waxworms. I treat them like dessert: occasional, deliberate, never a habit.

Hornworms

The hydration feeder — around 85% moisture, low fat, modest ~9% protein. Brilliant for a dehydrated gecko, one that's a little constipated, or just to add water in a dry stretch. They grow fast, so feed them at an appropriate size before they balloon. They can't anchor a diet (9% protein won't do it), but as a juicy, low-fat treat they're one of my favorites. Still phosphorus-heavy — dust them.

Superworms

The enrichment feeder for adults — big, wriggly, and they put on a show that triggers a strong feeding response. But ~17% fat and a hard head capsule mean moderation: an adult-only variety item, a few at a time, not a staple. Skip them for small juveniles where the tough exoskeleton raises impaction risk.

The universal point: none of these three is a complete diet. They're tools for specific situations layered onto a staple of roaches or crickets.

Sizing feeders correctly

This is where care guides go vague, so let me be concrete. The rule every leopard gecko keeper should tattoo somewhere:

A feeder should be no longer than the width of the space between the gecko's eyes.

Too big a feeder is a genuine hazard — choking, or impaction where indigestible bits lodge in the gut. When in doubt, go smaller; a gecko will happily eat several small feeders, and small is always safer than big.

By life stage:

• ◆Hatchlings (0–2 months): Tiny prey only — small discoid nymphs, pinhead-to-small crickets, small BSFL. Sized to that eye-width rule, which on a hatchling is small indeed.
• ◆Juveniles (2–10 months): Small-to-medium nymphs and appropriately sized crickets, scaling up as the gecko grows. This is the fast-growth window — frequent, protein-rich, well-sized meals.
• ◆Adults (10+ months): Medium-to-large discoid or dubia nymphs and adults, appropriately sized worms for variety. Adults can take a bigger feeder but still within the eye-width limit.

A practical tip: discoids' wide size range from tiny nymph to two-inch adult means a single colony can feed a gecko from hatchling to adult — you just harvest the right size for the moment. That versatility is a real, underrated advantage of keeping a roach colony over buying one fixed size of cricket.

Feeding schedule and frequency

Match feeding frequency to age and watch body condition — the tail tells you most of what you need to know.

• ◆Hatchlings and young juveniles: Feed daily. Offer as many appropriately sized feeders as the gecko eats enthusiastically in a 10–15 minute window, then remove leftovers (especially live crickets, which bite).
• ◆Older juveniles (around 6–10 months): Transition toward every other day as growth slows.
• ◆Adults: Every other day, or 2–3 times a week, a few feeders per session. Adults overeat readily, and obesity is the single most common pet leopard gecko health problem. A healthy adult tail is roughly as wide as the neck — plump, not bloated, and the belly shouldn't bulge.

Feed in the evening or at night — leopard geckos are crepuscular/nocturnal and most willing to hunt when it's dark and the warm side of the enclosure is up to temperature. And remember the digestion floor: a leopard gecko needs a warm side around 88–92°F (via an under-tank heat source on a thermostat, with a belly-heat surface around there) to digest properly. A cold gecko won't eat and can't digest what it does eat — if a gecko suddenly stops eating, check temperatures before you worry about the food.

Gut-loading: feeding the feeders

Gut-loading is the highest-leverage, lowest-cost thing you can do for your gecko's nutrition, and most people half-do it. The principle: whatever the feeder ate in the 24–48 hours before you offer it becomes part of your gecko's meal. A feeder fed garbage is a garbage delivery vehicle, no matter how good the species is on paper.

The protocol I use:

1. ◆Keep a quality dry base available at all times — a commercial roach/cricket chow or a quality whole-grain mix gives steady protein. This is the everyday backbone.
2. ◆For 24–48 hours before feeding off, load up on nutrient-rich produce: dark leafy greens (collard, mustard, dandelion — these are also relatively calcium-rich), carrots, squash, sweet potato. This is the actual "gut-load," timed so the feeder is packed when your gecko eats it.
3. ◆Provide clean hydration — water crystals/gel or a damp sponge, never an open dish that small feeders drown in.

Avoid feeding the feeders anything you wouldn't want in your gecko: heavy citrus, salty/oily/processed food, and anything that might carry pesticide. Wash produce first.

A key honest point: gut-loading is not a substitute for dusting. Loading with calcium-rich greens helps the ratio at the margin, but it does not turn a phosphorus-heavy insect into a calcium-positive one. You do both — gut-load and dust.

Supplementation: calcium and vitamins done right

This is the part that prevents metabolic bone disease, so get it right.

Why it's non-negotiable: Every common feeder except BSFL is phosphorus-heavy. A leopard gecko needs more calcium than phosphorus overall. The gap is closed by dusting feeders with supplement powder before they go in.

A workable routine for most keepers:

• ◆Plain calcium (no D3): Dust feeders at most feedings. Lightly toss the feeders in a cup with a pinch of powder so they're coated but not caked.
• ◆Calcium with D3: On a schedule — commonly once or twice a week — because D3 lets the gecko actually use the calcium. If your gecko gets little or no UVB, D3 supplementation matters more; if you provide low-level UVB lighting, it can synthesize some D3 itself and you lean less on the supplement. Don't massively overdo D3 — it's fat-soluble and can build up.
• ◆Multivitamin: Once a week or so, rotated in, to cover trace vitamins and minerals (including vitamin A). Rotating supplements prevents both deficiencies and the rarer problem of oversupplementation (e.g., vitamin D toxicity).

Some keepers also leave a small dish of plain calcium in the enclosure for self-regulation, which many geckos use as needed. It's a reasonable backstop, not a replacement for dusting.

The Merck Veterinary Manual's reptile sections are a solid non-commercial reference if you want to go deeper on calcium, D3, and the mechanics of metabolic bone disease — it's worth understanding why this routine exists, not just following it.

Rotating feeders to avoid dietary gaps

No single insect is nutritionally complete, so variety isn't a luxury — it's how you cover gaps and keep a gecko interested in eating. Here's a realistic rotation built on a roach staple:

• ◆Staple, most feedings: Discoid (or dubia) roaches, or crickets. This is 70–80% of what your gecko eats.
• ◆Variety, occasionally: Crickets if roaches are your staple (or vice versa), plus BSFL rotated in for their calcium.
• ◆Treats, sparingly: A hornworm now and then for hydration; a superworm for adult enrichment; a waxworm only to fatten a thin gecko or as a rare indulgence.

A sample week for an adult on an every-other-day schedule might be: roaches → (off) → roaches → (off) → BSFL or crickets → (off) → roaches. Slot a hornworm in instead of one staple meal every couple of weeks for hydration; reserve waxworms for when a gecko actually needs the calories.

Two rules ride along with rotation: gut-load everything for 24–48 hours, and dust appropriately (calcium most meals, D3 and multivitamin on schedule). Variety plus loading plus dusting is the whole game.

Common leopard gecko feeding myths

The original article ran through these and they're worth keeping, because each one hurts geckos.

"Leopard geckos can only eat crickets and mealworms." False, and limiting. They thrive on a varied diet — roaches, BSFL, the occasional hornworm or silkworm. Variety covers nutritional gaps and provides enrichment. A gecko fed one insect for years is a gecko with a slow-accumulating deficiency.

"You can feed insects caught outside." Don't. Wild-caught insects may carry pesticides, parasites, or pathogens. Captive-bred feeders raised in controlled conditions — like discoids — are the safe choice. The risk isn't worth the free bug.

"Dusting with calcium is enough on its own." No. Calcium without D3 (and without enough UVB) often can't be absorbed, and a gecko needs trace vitamins too. Calcium, D3, and a rotated multivitamin together — plus gut-loading — is the complete picture.

"Leopard geckos need feeding every day." Only the young ones. Adults do well on every-other-day or 2–3 times a week. Daily feeding an adult is how you create an obese gecko with a fatty liver. Feed to body condition, not to a rigid daily habit.

"Discoids have great calcium so you can skip dusting." The myth this guide exists to kill. Discoids are phosphorus-heavy like nearly every feeder. Dust them.

Choosing feeders for your specific gecko

Beyond the general staple-and-rotate plan, tailor to the individual:

• ◆By nutrition need: For a healthy gecko, a roach or cricket staple covers it. For a gecko that needs to gain weight, lean briefly on higher-fat feeders (a few extra waxworms or superworms) until condition recovers, then pull back. For an overweight gecko, cut the fatty treats entirely and stick to lean roaches/crickets on a stretched schedule.
• ◆By size and age: Smaller, softer feeders for hatchlings and juveniles (small discoid nymphs, BSFL, small crickets); larger feeders for adults — always within the eye-width rule.
• ◆By feeding behavior: A gecko that hunts by movement may need the twitch of a cricket, or you wiggling a roach with tongs, to trigger a strike. A calmer gecko takes slow discoids happily and you avoid the cricket downsides.
• ◆By health status: A dehydrated or constipated gecko benefits from a watery hornworm; a sick or recovering gecko from soft, easy-to-digest feeders. If a gecko is genuinely unwell or you suspect MBD, see a reptile vet — diet adjustments support treatment but don't replace it.

Hydration: the overlooked half of nutrition

Diet conversations fixate on protein and fat and forget water, but a dehydrated gecko won't eat well, won't shed cleanly, and is prone to constipation and impaction. Leopard geckos get most of their water three ways, and a good feeding plan supports all three.

• ◆A clean water dish, always available. Shallow, stable, refreshed daily. Some geckos drink from it openly, some only at night.
• ◆Moisture from feeders. This is where feeder choice intersects with hydration. High-moisture feeders — hornworms at ~85% water, and to a lesser extent crickets at ~70% — deliver real water with the meal. This is exactly why I reach for a hornworm when a gecko looks a little dry, is straining to pass waste, or is heading into a shed. Drier feeders like mealworms contribute little.
• ◆A humid hide. A moist hide (a covered box with damp sphagnum moss or paper towel) isn't diet, strictly, but it works hand-in-hand with it: it aids shedding and gives the gecko a place to absorb ambient moisture. A gecko with a good humid hide and the occasional juicy feeder rarely has hydration trouble.

The takeaway for diet planning: don't run a gecko exclusively on dry feeders. Even with a roach staple, rotate in a watery treat periodically, especially around sheds and in dry seasons or dry-climate homes.

Troubleshooting a leopard gecko that won't eat

A gecko going off food is the most common worry I get asked about, and the fix is almost never "buy a different feeder." Work the causes in order of likelihood:

• ◆Temperature first, always. A leopard gecko that can't reach a warm side around 88–92°F can't digest and won't hunt. This is the number-one reason a healthy gecko stops eating, especially in winter when room temps drop. Put a thermometer on the warm surface and read it before changing anything else.
• ◆Shedding. Geckos often refuse food for a day or two around a shed. Look for dull, grayish skin. Make sure the humid hide is damp, wait it out, and check that no shed is stuck on toes or over the eyes afterward.
• ◆Feeder too big or intimidating. Offer something smaller. A feeder over the eye-width limit can put a gecko off entirely, and a fast, large cricket can stress a timid one.
• ◆Wrong feeding response for the feeder. A gecko that hunts by movement may simply ignore a calm, slow discoid sitting still. Wiggle it with soft-tipped tongs to imitate live movement, or offer a livelier cricket to trigger the strike, then transition back.
• ◆It's an adult that doesn't need daily food. A skipped meal in an adult on an every-other-day schedule is often just a well-fed animal, not a problem — check the tail; if it's plump, relax.
• ◆Stress or environment change. New enclosure, new home, too much handling, or a too-bright/too-exposed setup can suppress appetite. Give a new gecko a week of quiet to settle before worrying.
• ◆Persistent refusal, weight loss, or illness signs. If a gecko refuses food for more than a couple of weeks, is losing tail fat, or shows tremors, a swollen jaw, or lethargy, see a reptile vet. Prolonged anorexia plus poor body condition is not a feeding-preference issue — it's a medical one.

The reassuring reality: the overwhelming majority of "won't eat" cases trace back to temperature or a shed, not to the food itself. Fix the husbandry and the appetite comes back.

Why discoids are a sustainable choice

One last point in the discoid column that's easy to overlook: they're a genuinely sustainable, low-resource feeder. They're hardy, eat simple food (vegetable scraps, dry grains — often byproducts you'd otherwise toss), and breed in a controlled indoor bin without pesticides. They produce little odor and relatively little ammonia compared to crickets, and because they can't survive outdoors in most climates, the ecological risk if one escapes is minimal. For a keeper who wants to own their feeder supply rather than buy crickets weekly, a discoid colony recycles kitchen scraps into a clean, renewable, high-quality staple. That's good for your gecko, your wallet, and the environment all at once — and once it's set up, it mostly runs itself.

The short version

Build a leopard gecko's diet on a soft-bodied roach staple — discoid (Blaberus discoidalis) or dubia, with discoids the legal choice in Florida — or on crickets if you'd rather not keep roaches. Keep mealworms, superworms, and waxworms as occasional items, not staples; use hornworms for hydration and BSFL for their rare good calcium. Gut-load every feeder for 24–48 hours, dust with calcium at most feedings (because every feeder but BSFL is phosphorus-heavy — yes, including discoids), and add D3 and a multivitamin on a schedule. Size feeders to no wider than the space between the eyes, feed hatchlings daily and adults every other day, keep the warm side around 88–92°F so digestion works, and watch the tail for body condition. Do that and you'll have a healthy, well-fed gecko for the next decade and a half.

Want to grow your own staple? See my full discoid roach keeping and breeding playbook, or compare the two top roaches head-to-head in dubia vs. discoid roaches: which is healthier for leopard geckos. Browse the full exotic animal care library for more gecko and feeder guides.