Why I Don't Recommend Superworms as a Staple (And What to Use Instead)
- Role
- Treat only
- Protein
- ~18%
- Fat
- ~15%
- Moisture
- ~60%
- Chitin
- moderate
- Ca:P
- 1:14
- Calcium-rich
- No (dust it)
- Best for
- Treat / weight-gain for adult animals
I get asked constantly why I steer keepers away from superworms when every pet store sells them by the cup. The short answer: availability isn't quality. Superworms (Zophobas morio) are cheap and easy to find, but as a regular feeder they cause more problems than they solve. Here's the honest breakdown, and the feeders I reach for instead.
The problem with superworms
Three issues stack up when superworms become a staple rather than a treat.
| Issue | Reality | Why it matters |
|---|---|---|
| Fat content | ~18% | Roughly 2.5x the fat of discoid roaches. Drives obesity, fatty liver, and gout with regular use. |
| Calcium ratio | Phosphorus-heavy | Like most feeders, far more phosphorus than calcium, so it works against bone health unless heavily supplemented. |
| Bite risk | Strong mandibles | Can bite a reptile during feeding, or from inside the mouth/gut if swallowed alive. |
| Tough chitin | Heavy exoskeleton | Impaction risk, especially for juveniles and smaller species. |
| Palatability | Very high (fat) | Animals get "hooked" and start refusing healthier feeders. |
That last point is the sneaky one. Because superworms are fatty, they're delicious, and a reptile fed unlimited superworms behaves like a kid given unlimited candy: it starts rejecting anything else. I've untangled plenty of leos and beardies that went on hunger strikes the moment the superworms stopped.
Superworms vs the better options
Here's how superworms compare to the feeders I actually stock my rotation with. Note that I'm not claiming roaches are calcium-rich; like nearly all feeders they need calcium dusting. BSFL is the genuine calcium exception.
| Metric | Superworms | Discoid roaches | Silkworms | Hornworms |
|---|---|---|---|---|
| Protein | ~20% | ~20% | ~13% | ~9% |
| Fat | ~18% | ~7% | ~1% | ~3% |
| Bite risk | Yes | No | No | No |
| Chitin | Heavy | Moderate | None | None |
| Moisture | Moderate | Moderate | High | ~85% |
| Gut-loadable | Moderate | Excellent | No | Limited |
| Needs calcium dusting | Yes | Yes | Yes | Yes |
The headline: discoid roaches match superworms on protein while carrying less than half the fat, with no bite risk and far better gut-loading. That's why roaches, not superworms, are my protein base.
What to use instead
- For daily protein: Discoid roaches. Same protein as superworms, under half the fat, no bite, and they're the best gut-load candidate of any feeder. Dust with plain calcium.
- For calcium: Black soldier fly larvae (BSFL). Genuinely calcium-rich, so you don't dust them. Once or twice a week.
- For low-fat variety: Silkworms. Around 1% fat, soft-bodied, zero chitin. Ideal for overweight or recovering animals.
- For hydration and enrichment: Small hornworms. High moisture, strong feeding trigger, no addictive fat load.
"But my reptile loves superworms"
Of course it does. The fat is the draw. The fix is a gradual transition, not cold turkey. Mix discoid roaches in with the superworms and tilt the ratio toward roaches over two to four weeks until the superworms are gone. Most animals accept roaches without drama once the habit breaks. For a truly stubborn eater, a small hornworm or two as a bridge feeder usually reopens the appetite.
When superworms are actually fine
I'm not anti-superworm, I'm anti-superworm-as-staple. They earn a spot in these cases:
- Underweight animals that need rapid calories to recover. Here the high fat is a feature.
- Large, high-burn species like adult monitors and tegus that metabolize the fat without issue.
- An occasional treat, once a week at most, alongside a leaner staple.
For everything else, discoid roaches deliver the same protein with far less fat and none of the bite risk. You can browse discoid roaches at All Angles Creatures to make the switch. For the veterinary view on feeder nutrition and metabolic bone disease, the Merck Veterinary Manual is a solid reference.
See also discoid roaches vs superworms and the full best feeder insects for leopard geckos ranking.