Hornworm Nutrition Guide
The honest answer is that we know less.
Hornworms may be the easiest of our four feeders to recognize nutritionally: they're exceptionally high in moisture and soft-bodied.
Beyond that, the scientific record gets thin quickly.
Our research did not locate an accessible, laboratory-grade published nutritional analysis of commercially raised Manduca sexta with a clearly stated analytical basis.
Rather than fill those gaps with numbers borrowed from unsourced charts, we show what the available evidence supports — and identify what remains uncertain.
What we can reasonably say
| Nutrient | Available information |
|---|---|
| Moisture | ~85% |
| Crude protein | ~9–10% |
| Crude fat | Published figures disagree |
| Calcium | Limited verified data |
| Phosphorus | Limited verified data |
| Key characteristic | Very high moisture |
Available producer and reference figures agree closely on moisture and reasonably closely on protein, but disagree approximately threefold on fat. For that reason, we do not publish a single definitive fat percentage for hornworms.
Moisture is the standout characteristic
At approximately 85% water, hornworms contain more moisture than the other three feeders in this guide set.
For comparison, the research reviewed here places mealworms around 62% moisture and house crickets around 69–77%, depending on life stage.
That high water content is what makes hornworms particularly useful when hydration and dietary variety are priorities.
It also means a gram of hornworm contains a great deal of water, so high moisture should not be confused with unusually high nutrient density.
Soft-bodied doesn't mean nutritionally complete
Hornworms have a thin, minimally sclerotized cuticle compared with harder-bodied feeders.
That makes them physically different from crickets, roaches and mealworms — but it doesn't make them a complete diet.
Their composition is also influenced by the artificial diet on which commercially raised hornworms are produced, so variation between producers and batches should be expected.
We therefore view hornworms primarily as a useful source of moisture and variety, not as a replacement for a varied feeder rotation.
Why some numbers are missing
There is a temptation with nutrition charts to make every row complete.
We'd rather leave a row incomplete than fill it with an unsupported number.
The research record for commercially raised hornworms simply isn't as mature as it is for house crickets and mealworms.
There is a zoo-nutrition analysis of tobacco hornworms identified in the research literature, but the complete data table was not available in the materials we could verify for these guides.
Until we have stronger data — or laboratory analysis of our own insects — we'll keep the limitations visible.
Does hornworm size matter?
Hornworms grow extraordinarily quickly, but published research does not provide reliable nutritional values for each commercial size.
Our Small, Medium, Large and Extra Large hornworms therefore do not receive different nutrition labels.
Size should be chosen according to the animal eating the feeder, not because we claim an Extra Large hornworm has a particular protein percentage that a Small hornworm doesn't.
Where hornworms fit
Hornworms provide something meaningfully different from the other insects we raise: very high moisture, a soft body and another source of dietary variety.
They're useful as part of a broader feeding program — not because they're nutritionally “better” than other feeders, but because no single feeder needs to do every job.
Explore: Hornworm Care & Storage · Feeder Size Guide · Gut Loading Feeder Insects
About our nutrition data
Feeder-insect composition can vary with species, life stage, diet, gut contents, rearing conditions and laboratory method. We identify whether figures are as-fed or dry-matter, publish ranges when the research gives ranges, and leave values unpublished when reliable species-specific data aren't available.