Eating bugs is, for the most part, harmless. Humans have been consuming insects for thousands of years, and roughly 2 billion people worldwide eat them regularly as part of their normal diet. If you accidentally swallowed a bug or you’re curious about trying edible insects on purpose, your body is well equipped to handle it. That said, there are a few things worth knowing about nutrition, allergies, parasites, and the insects you should genuinely avoid.
Accidentally Swallowing a Bug
If a fly, gnat, or small beetle ended up in your mouth, you’ll be fine. Your stomach acid will break it down like any other protein. You might feel a brief gag reflex or notice an unpleasant taste, but there’s no medical concern from a single accidental encounter.
You’re also eating insects without knowing it, all the time. The FDA sets allowable limits for insect fragments in processed foods because eliminating them entirely is impossible. Peanut butter can contain an average of 30 insect fragments per 100 grams. Chocolate is allowed up to 60 fragments per 100 grams. Wheat flour tops both at 75 fragments per 50 grams. These levels are considered safe and pose zero health risk. By some estimates, the average person consumes one to two pounds of insect parts per year through everyday foods.
Nutritional Value of Edible Insects
Insects are surprisingly nutrient-dense. Mealworm larvae contain about 25 grams of protein per 100 grams, which edges out beef sirloin at 20.1 grams. House crickets come in around 15 to 20 grams of protein per 100 grams depending on their life stage. Certain cricket species pack nearly three times the iron of beef: up to 9.5 mg per 100 grams compared to beef’s 3.1 mg. Vitamin B12 levels are lower than beef but still present, ranging from 0.47 to 0.87 micrograms per 100 grams versus 1.4 in beef sirloin.
Insects also contain fiber in the form of chitin, the crunchy material that makes up their exoskeletons. Your body does produce enzymes called chitinases that can partially break down chitin, though humans aren’t as efficient at it as animals that eat insects regularly. The chitin that isn’t fully digested acts similarly to insoluble fiber, passing through your gut without causing problems.
The Shellfish Allergy Connection
This is the most important safety consideration. If you have a shellfish allergy, eating insects could trigger a reaction. The reason is a protein called tropomyosin, which is found in shrimp, crab, lobster, and also in insects like crickets, mealworms, and cockroaches. The amino acid sequences overlap significantly between crustaceans and insects, meaning your immune system can mistake one for the other.
People with dust mite allergies may also be at risk, since dust mites share this same protein family. That said, cross-reactivity doesn’t always cause symptoms. Research has found that many people who test positive for shellfish antibodies due to mite or cockroach sensitization never experience an actual allergic reaction to shellfish or insects. The overlap is real at the molecular level but doesn’t always translate into a clinical problem. Still, if you have a known shellfish allergy, it’s worth being cautious before trying edible insects for the first time.
Parasites and Bacteria in Raw Insects
Eating raw or improperly handled insects carries real risk. A study examining 300 insect farms found parasites in over 81% of them, and in about 30% of cases, those parasites were species potentially harmful to humans. The organisms detected included tapeworm larvae, Cryptosporidium (which causes severe diarrhea), and Entamoeba histolytica, which can cause dysentery. Bacteria like Salmonella and Campylobacter, common culprits in food poisoning, are also transmitted by insects.
Cooking eliminates most of these risks. Roasting, boiling, or frying insects kills parasites and pathogenic bacteria just as it does in meat or poultry. The danger comes from eating wild-caught insects raw, or from poorly managed farms with contaminated feed or substrate. Commercially produced edible insects sold in regulated markets are generally raised under controlled conditions and heat-processed before sale.
Insects You Should Never Eat
Not all bugs are safe. Brightly colored insects are often advertising their toxicity. Blister beetles produce cantharidin, a compound that causes chemical burns to your mouth, throat, and digestive tract. Even a small number can be dangerous. Monarch butterflies and other species that feed on toxic plants accumulate those chemicals in their bodies. Stinging insects like bees and wasps can still cause reactions from their venom even after death if the stinger or venom sac is intact.
A simple rule: avoid any wild insect you can’t positively identify as safe, especially those with bright warning colors (reds, oranges, yellows) or a strong, unpleasant smell. Stick to species with a long history of human consumption, such as crickets, mealworms, grasshoppers, and certain ant species.
Antinutrients in Insects
Like many plant foods, insects contain compounds called antinutrients that can interfere with mineral absorption. The most commonly found are phytates and oxalates, which bind to minerals like iron and zinc in your gut and reduce how much your body actually absorbs. Hydrocyanide has also been detected in some species. At normal consumption levels, these compounds aren’t dangerous, but eating large quantities of insects over long periods could theoretically reduce the nutritional benefit you’re getting. Cooking and processing tend to reduce antinutrient levels, just as they do in beans or grains.
Why Insects Are Gaining Popularity
Beyond personal health, there’s a practical reason insects are showing up in protein bars and snack foods. Producing one pound of cricket protein requires about 1 gallon of water. Producing the equivalent amount from beef requires roughly 2,000 gallons. Crickets need 1.7 pounds of feed to produce a pound of usable food, while cattle need about 10 pounds. They also require a fraction of the land and grow roughly 13 times faster than cows. For people looking to reduce the environmental footprint of their protein intake, insects are one of the most efficient options available.