A bearded dragon’s diet is a mix of live insects, leafy greens, vegetables, and a small amount of fruit, with the ratio shifting dramatically as the animal ages. Young bearded dragons need a protein-heavy diet of roughly 70–80% insects and 20–30% plants, while adults flip that ratio almost entirely, eating 70–80% greens and vegetables with only 20–30% insects. Getting this balance right is the single most important factor in keeping a bearded dragon healthy long-term.
How the Diet Changes With Age
Baby bearded dragons under one month old need to eat two to three times per day, and nearly all of that food should be live insects. Their bodies are growing fast, and protein fuels that growth. From one to four months, you can scale back to twice-daily feedings but keep the ratio heavily weighted toward insects. Once a dragon reaches about four months old, one feeding session per day is enough, and you should start introducing more greens and vegetables into the mix.
By adulthood (usually around 12 to 18 months), the diet looks completely different. An adult bearded dragon’s daily plate should be about 70–80% salad greens, 20–30% other vegetables, and just 2–5% fruit. Insects become a smaller but still essential part of the diet, offered a few times per week rather than multiple times a day. Overfeeding insects to adults is a common mistake that leads to obesity.
Best Greens and Vegetables
Dark, leafy greens should form the backbone of an adult bearded dragon’s diet. The best everyday staples include collard greens, turnip greens, dandelion greens, and mustard greens. These are nutrient-dense and have a favorable ratio of calcium to phosphorus, which matters more than you might expect (more on that below). Other good options are bok choy, escarole, watercress, and bell peppers. You can also offer green beans, broccoli, and kohlrabi for variety.
Some greens need to be limited. Spinach, Swiss chard, and beet greens contain oxalates, compounds that bind to calcium and block your dragon from absorbing it. Feeding these occasionally is fine, but they shouldn’t be a staple. Cabbage, kale, and mustard greens contain goitrogens, which can interfere with thyroid function in large amounts. Kale and mustard greens are still widely recommended as regular options since the goitrogen levels are low enough to be safe in a varied rotation, but you wouldn’t want to feed any single one of these exclusively.
Avoid iceberg lettuce and celery entirely. They’re mostly water and fiber with almost no nutritional value, essentially empty calories that fill your dragon up without giving it what it needs.
Feeder Insects Worth Using
Crickets and dubia roaches are the most popular staple feeder insects, and for good reason. They’re widely available, easy to gut-load, and provide a solid protein source. Black soldier fly larvae (sometimes sold as Phoenix worms or calcium worms) are another excellent choice because they’re one of the few feeder insects that naturally contain more calcium than phosphorus, so they don’t need to be dusted with calcium powder before feeding.
For comparison, black soldier fly larvae contain about 17% protein and 11% fat, while most roaches and crickets are leaner with around 3% fat. That fat content matters if you’re feeding an adult dragon that doesn’t need as many calories. Superworms and waxworms are higher in fat and work better as occasional treats rather than daily feeders.
Gut-Loading Your Feeders
The nutritional value of a feeder insect depends heavily on what that insect ate before your dragon eats it. This process, called gut-loading, means feeding your insects nutrient-rich foods 24 to 48 hours before offering them. Good gut-loading ingredients include carrots, sweet potatoes, collard greens, mustard greens, broccoli, apples, oranges, rolled oats, and ground legumes. Commercial gut-load products designed to be calcium- and vitamin-rich also work well. Skipping this step essentially means feeding your dragon hollow calories.
Fruit as an Occasional Treat
Fruit should make up no more than 5% of a bearded dragon’s diet. The sugar content is simply too high for regular feeding and can contribute to obesity and digestive issues over time. Safe options include papaya, melon, strawberries, blueberries, and banana. Offer small pieces once or twice a week at most, and think of fruit as a treat rather than a dietary staple.
Foods That Are Dangerous or Toxic
Some foods are genuinely dangerous. Fireflies are lethal to bearded dragons, even a single one can kill. Avocado, rhubarb, onion, and garlic should never be offered. Poisonous mushrooms (essentially any wild mushroom you can’t positively identify) are also off-limits. Moldy or rotten produce is a risk for bacterial infection. And while iceberg lettuce isn’t toxic, it’s nutritionally worthless enough that it can cause problems if it displaces real food in the diet.
Why Calcium and Phosphorus Matter So Much
The most common serious health problem in captive bearded dragons is metabolic bone disease, a condition where bones become soft, deformed, and fragile. It happens when a dragon doesn’t get enough calcium, can’t absorb the calcium it does get, or takes in too much phosphorus relative to calcium. Phosphorus competes with calcium for absorption, so even a dragon eating plenty of calcium can develop problems if the phosphorus ratio is off.
This is why calcium-to-phosphorus ratios in food matter, why oxalate-heavy greens are limited, and why supplementation is a non-negotiable part of bearded dragon care.
Supplement Schedule
Even with perfect food choices, captive bearded dragons need calcium and vitamin supplements dusted onto their food. A practical weekly schedule looks something like this:
- Calcium without D3: Most meals, with an occasional day off. This is the supplement you’ll use most often.
- Calcium with D3: Every couple of meals. Vitamin D3 is essential for calcium absorption, but it’s fat-soluble and builds up in the body, so overdoing it can cause toxicity.
- Multivitamin: About once a week. Look for one containing preformed vitamin A, since most reptiles can’t convert plant-based vitamin A on their own. Like D3, vitamin A is fat-soluble and can become toxic in excess, which is why once weekly is enough.
A sample rotation might be calcium without D3 on Monday, Wednesday, and Friday, calcium with D3 on Thursday, multivitamin on Sunday, and a rest day on Tuesday. Supplements only work properly when your dragon also has correct UVB lighting, which enables vitamin D3 processing. Replace UVB bulbs every 6 to 12 months, since they lose effective output before they burn out visibly.
Hydration
Bearded dragons are desert animals and don’t drink large amounts of water. Research from the American Veterinary Medical Association found that after 48 hours without food or water, bearded dragons consumed less than 1% of their body weight in water when given access, suggesting they’re naturally resistant to dehydration compared to other reptiles. Still, fresh water should always be available in a shallow dish. Many dragons rarely drink from a bowl, so additional hydration strategies help: soaking your dragon in a shallow warm water bath once or twice a week, and offering water-rich greens and vegetables daily. The moisture content in fresh produce does a surprising amount of the hydration work for this species.