Benefits
Muscle protein synthesis equivalent to milk protein
A double-blind RCT in healthy young men compared 30 g lesser mealworm-derived protein vs 30 g milk protein concentrate post-resistance exercise using stable isotope tracers. Muscle protein synthesis rates increased equivalently after both proteins, both at rest and post-exercise, with mealworm-derived amino acids incorporated into new muscle protein at similar rates to milk-derived. The authors concluded postprandial protein handling of lesser mealworm does not differ from milk protein concentrate.
No advantage over carbohydrate in a resistance training trial
An 8 week training trial gave 18 young men lesser mealworm protein isolate or an isocaloric carbohydrate after workouts and before bed. Both groups gained lean mass and strength, but there was no significant difference between them, so the insect protein added nothing over carbohydrate in men who were already eating plenty of protein. A 2026 systematic review of 4 randomized trials found that cricket and mealworm proteins raise peak blood amino acid levels less than whey or milk, yet produce no different skeletal muscle anabolic response. A smaller 12 week trial in 39 older women reported gains in muscle mass and strength with 30 g a day of hydrolyzed cricket protein, most clearly when it was combined with training.
Sustainability and environmental footprint
Farmed insects generally need less land and emit fewer greenhouse gases per kilogram than beef, and a much larger share of the animal is edible, roughly 80 percent of a cricket against about 40 percent of cattle, which is where the often quoted feed-efficiency figures come from. The FAO has highlighted edible insects as one option for sustainable protein. The very large multipliers repeated in marketing, such as 2,000 times less water or 100 times fewer greenhouse gases, trace back to early estimates that did not fully count the feed crops insects are raised on. A 2026 critical review in Biological Reviews concluded that the environmental benefits of insect farming have been overstated, that most of the evidence comes from small-scale operations so the impact of large-scale production is still unknown, and that insect foods in practice tend to replace plant foods rather than meat. This is an environmental argument rather than a health benefit.
Complete amino acid profile
Cricket and mealworm proteins are 'complete' — containing all 9 essential amino acids in adequate proportions. PDCAAS (Protein Digestibility Corrected Amino Acid Score) of cricket protein is approximately 0.7-0.8 — comparable to many plant proteins, lower than whey (1.0). Lysine and leucine content adequate for typical adult needs. Better amino acid profile than most plant proteins (especially beans/grains).
Micronutrient density (iron, B12, zinc)
Insects provide iron, vitamin B12 (rare in non-animal proteins), zinc, magnesium, and omega-3 and omega-6 fatty acids. Iron content is high, but a human stable-isotope study found iron from house crickets is poorly absorbed, so this is not a dependable way to raise iron status. Cricket flour: ~6-9 mg iron per 100 g (vs ~3 mg in beef); ~5-7 μg B12 per 100 g. Higher micronutrient density than most plant proteins. Useful for nutrient-dense protein in calorie-controlled diets.
Mechanism of action
Standard protein anabolism (mTORC1 → MPS)
Insect proteins, like all complete proteins, deliver essential amino acids that activate mTORC1 signaling → muscle protein synthesis. Leucine content (typically 7-9% of protein) is sufficient to trigger anabolic threshold at typical 25-30 g doses. Mechanism identical to whey/casein/beef/plant proteins.
Chitin and chitosan: prebiotic fiber
Insect exoskeletons contain chitin (poly-N-acetyl-D-glucosamine), a fiber that humans cannot digest enzymatically but which gut bacteria can ferment. May provide modest prebiotic effect. Highly purified protein isolates strip most of the chitin out, while whole-insect flours keep it. In the one human trial of whole cricket powder, 25 g a day for 14 days increased the probiotic species Bifidobacterium animalis and was well tolerated. Chitin also appears to be one of the things blocking iron absorption from crickets, so it is not purely an upside.
Iron and B12 content, with poor iron absorption
Insects are a good source of iron by content, but the iron is non-heme rather than heme, and the human absorption data are not encouraging: a randomized crossover stable-isotope study in 20 iron-depleted women found only about 3 percent of the iron in house crickets was absorbed, against about 14 percent from a reference iron salt, with chitin, chitosan and calcium in the cricket biomass limiting uptake. Vitamin B12 is found in insect tissues (likely from gut bacteria of the insects themselves). That makes insect protein a reasonable B12 source for people cutting back on red meat, but not a reliable way to correct low iron.
Antimicrobial peptides
Insects produce antimicrobial peptides (AMPs) as part of their innate immunity. Some research interest in whether insect-derived AMPs in food products contribute to health benefits — though most AMPs are denatured during processing. Current relevance modest but interesting research direction.
Clinical trials
Double-blind randomized controlled trial with stable isotope tracers (Hermans WJH, Senden JM, Churchward-Venne TA, Paulussen KJM, Fuchs CJ, Smeets JSJ, van Loon JJA, Verdijk LB, van Loon LJC 2021, Am J Clin Nutr 114(3):934-944, doi:10.1093/ajcn/nqab115). NL6897.
24 healthy young men ingested 30 g intrinsically L-[1-13C]-phenylalanine and L-[1-13C]-leucine labeled lesser mealworm OR milk protein concentrate after unilateral resistance exercise. Primed continuous L-[ring-2H5]-phenylalanine, L-[ring-3,5-2H2]-tyrosine, L-[1-13C]-leucine infusions; frequent blood and muscle sampling.
Both proteins raised muscle protein synthesis. Resting rates went from about 0.025%/h to 0.045%/h on mealworm and to 0.056%/h on milk; post-exercise rates went from about 0.025%/h to 0.059%/h on mealworm and to 0.073%/h on milk. Milk was numerically higher at both time points, but the between-group differences were not statistically significant. Equivalent incorporation of dietary protein-derived 13C-phenylalanine into de novo muscle protein. Conclusion: 'Postprandial protein handling of lesser mealworm does not differ from ingesting an equivalent amount of milk protein concentrate in vivo in humans.' Foundational trial demonstrating insect protein's nutritional equivalence to dairy.
Systematic review of randomized controlled trials (Rutherford JAG, Elliott RM, Knott GP, Thatcher R, Manders RJF 2026, Nutrition Reviews 84(2):366-378, doi:10.1093/nutrit/nuae218). PMID 40511744.
Systematic review of 4 randomized controlled trials (100 participants in total) comparing insect protein (cricket, lesser mealworm) vs animal protein (whey, milk, beef) on protein bioavailability, anabolic response, or skeletal muscle adaptation in adult humans.
Two studies assessed postprandial blood amino acids only: one showed higher aminoacidemia from cricket vs beef; another higher aminoacidemia from whey vs lesser mealworm. Two studies directly assessed skeletal muscle anabolic response post-exercise: lower peak plasma AA from cricket/mealworm vs whey/milk, but no difference in actual skeletal muscle anabolism. Conclusion: 'Insects are a viable protein source that can likely support skeletal muscle anabolism to the same extent as conventional animal protein but with a considerably lower environmental impact.' Key finding: peak amino acid levels do not always predict anabolic outcomes.
Randomized controlled trial (Vangsoe MT, Joergensen MS, Heckmann LL, Hansen M 2018, Nutrients 10(3):335, doi:10.3390/nu10030335). PMID 29534456.
18 healthy young men randomized to 8 weeks of resistance training four days a week, taking either lesser mealworm protein isolate (n=9) or an isocaloric carbohydrate supplement (n=9) after training and before sleep on training days.
Both groups gained fat- and bone-free mass and improved leg press and bench press one-rep max, but there were no significant differences between the insect protein group and the carbohydrate group on any body composition or strength measure. The authors concluded that insect protein supplementation did not improve adaptations to eight weeks of resistance training compared with carbohydrate, and noted that habitual protein intake was already high in both groups. This is a null result and should be read as such.