24-hour minimum: Feeder insects pass their gut contents in roughly 12–24 hours. Any gut-load eaten less than 12 hours before feeding has not fully transferred its nutrients. Start gut-loading the day before you plan to feed, not the morning of.
Excellent gut-load foods
Collard greens
High calcium, great Ca:P ratio — one of the best gut-load greens available.
Dandelion greens
High calcium and vitamin A. Widely available and very well tolerated by most feeder insects.
Mustard greens
Excellent calcium content and nutritional density. Easy to source.
Sweet potato
High in beta-carotene and complex carbohydrates. Good energy source for feeder insects.
Butternut squash
High beta-carotene, vitamin A precursor, and good Ca:P ratio. Well accepted by dubias and crickets.
Good options
Carrot (in moderation)
Good beta-carotene but higher in sugar. Use alongside leafy greens rather than as the sole gut-load.
Apple (seedless)
Provides hydration and energy. Seeds contain cyanogenic compounds — always remove them.
Oats / rolled oats
Excellent dry gut-load base that keeps insects active without adding humidity. Use with leafy greens.
Bee pollen
Nutrient-dense additive used by many serious keepers. Small amounts sprinkled over other gut-load.
What to avoid
Spinach
High oxalate content binds calcium in the feeder's gut, reducing the calcium your gecko actually absorbs — counterproductive.
Iceberg lettuce
Almost pure water with negligible nutrients. Provides hydration but essentially no nutritional value.
Citrus fruits
High acid content stresses feeder insects and may cause them to die before feeding. Nutritionally poor choice.
Avocado
Toxic to many insects — will kill your feeders before they reach your gecko.
Broccoli / cauliflower
Goitrogenic compounds that interfere with thyroid function. Not suitable for feeder gut-loading.
How to gut-load different feeders
Dubia roaches
The easiest to gut-load. They have a large digestive tract and hold nutrients well. Place gut-load food in the bin 24–48 hours before feeding. Remove uneaten soft food after 24 hours to prevent mould.
Crickets
Gut-load for 24 hours minimum in a separate ventilated container. Crickets drown easily — keep water in gel crystals or fresh vegetables rather than an open dish. Overloading crickets causes them to die and spoil quickly.
Mealworms
Gut-load in a shallow tray with bran or oat base plus a piece of sweet potato or carrot as a moisture source. Change the moisture source every 2 days to prevent mould. Mealworms transfer gut-load nutrients less efficiently than roaches.
Waxworms / treat feeders
Do not gut-load waxworms — they are in a pupal stage and do not feed. Offer them as-is, sparingly, and not more than once or twice per month. Their value is as a high-fat treat, not a nutritional staple.
Hydration tip: Many insects get their moisture from fresh vegetables in the gut-load. A dehydrated feeder insect passes that dehydration on to your gecko. Always include a moist component — sweet potato, carrot, or collard greens — in every gut-load mix.