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 with a favourable Ca:P ratio for the insects you rotate in alongside the MRP diet.
Dandelion greens
High calcium and vitamin A precursors. Widely available and well accepted by crickets and dubia. Only use unsprayed greens.
Mustard greens
Calcium-rich and nutrient-dense. Easy to source and inexpensive.
Sweet potato
High in beta-carotene and a useful moisture source that keeps feeders active until offered.
Butternut squash
High in beta-carotene and generally well accepted by dubia and crickets.
Good options
Carrot (in moderation)
Good beta-carotene, but higher in sugar. Use alongside leafy greens rather than as the only gut-load.
Oats / rolled oats
A dry gut-load base that keeps insects active without adding excess moisture.
Commercial insect gut-load (dry)
Purpose-made dry gut-loads are balanced for feeder insects and easy to store.
What to avoid
Spinach
High oxalate content binds calcium in the feeder's gut, reducing the calcium the insect passes on.
Iceberg lettuce
Almost pure water with negligible nutrients. Hydrates the feeder but adds essentially no nutrition.
Citrus fruits
High acid content stresses feeder insects and can shorten their lives.
Avocado
Toxic to many animals and a poor choice for insects — do not use.
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.