What Do Bearded Dragons Eat? The Complete Diet Guide

Walk into any reptile forum and ask what bearded dragons should eat, and you’ll get a dozen conflicting answers before dinner. Some keepers swear by dubia roaches exclusively; others rotate half a dozen feeders. Some load the salad bowl with kale daily; others refuse to touch it. The debate is real — and most of it stems from outdated husbandry advice passed around since the 1990s, before there was solid nutritional research on captive beardies. The short answer: juveniles eat mostly insects, adults eat mostly greens, and the framework below is the one we use for Lia, our own bearded dragon.

The honest answer: bearded dragon nutrition is more nuanced than most generic care guides let on, but it’s not complicated once you understand two core principles. First, bearded dragons are omnivores whose dietary ratio shifts significantly with age. Second, what you feed their food matters almost as much as what you feed them. Lia, our own bearded dragon at Toronto Reptiles, eats exactly the diet described in this guide — and the difference between a well-fed beardie and a malnourished one shows up fast in bone density, shed quality, and alertness.

This guide covers the right insects and greens, the foods to avoid, the age-by-age feeding schedule, and the supplementation protocol that prevents the most common nutritional deficiencies. By the end, you’ll have a concrete framework — not a vague ingredient list — for feeding a bearded dragon correctly.

Key Takeaways

• Age determines the ratio: Juveniles (0–12 months) need ~70–80% insects, 20–30% plants. Adults (18+ months) flip to 70–80% plants, 20–30% insects.
• Dubia roaches are the gold-standard feeder — better calcium-to-phosphorus ratio than crickets, no noise, no escape, and easier for young dragons to catch.
• The everyday salad base should be collard greens, mustard greens, or turnip greens — nutrient-dense and low in oxalates. Kale and spinach are rotation greens, not daily staples.
• Calcium supplementation is non-negotiable — dust feeders at every meal for juveniles; 4–5 times per week for adults. Skipping this is the fastest route to metabolic bone disease.
• Fireflies are lethal to bearded dragons. Their bioluminescent compound, lucibufagins, is toxic in even tiny doses. Never feed them under any circumstances.

The Omnivore Balance: Why Age Changes Everything

Bearded dragons in the wild — central Australia, across arid scrublands and open woodland — eat a mix of insects, small animals, flowers, plant matter, and fruit depending on seasonal availability. In captivity, we replicate that nutritional breadth with commercially available feeders and fresh produce.

The key shift: protein drives growth in young dragons, while fibre, vitamins, and minerals sustain adults. A juvenile that doesn’t get enough insect protein will grow slowly with weak bones. An adult eating too many insects accumulates excess protein and fat — stressing the kidneys and liver over time. The age-based dietary ratio isn’t a preference; it’s a physiological requirement that changes as the animal matures.

Feeder Insects: The Best Options and Why

Not all feeder insects are nutritionally equal. The key metric is the calcium-to-phosphorus (Ca:P) ratio. You want feeders with a ratio as close to 2:1 as possible — phosphorus binds calcium in the gut, so high-phosphorus feeders actively deplete bone calcium when given without supplementation. Most insects are naturally phosphorus-heavy, which is why dusting matters so much.

Dubia Roaches — Best Overall

Dubia roaches (Blaptica dubia) are the best feeder for bearded dragons across almost every metric: high protein, better Ca:P ratio than crickets (~1:3 vs. crickets’ ~1:9 without supplementation), easy to gut-load, quiet, and unable to escape most enclosures. Slower movement means juvenile dragons with less hunting experience can still catch them reliably.

Ontario-specific note: dubias are legal to keep and sell within the province but cannot be transported across provincial or international borders. Source from a local breeder or an established supplier that ships within Ontario.

Crickets — Good Alternative

Crickets are nutritious, widely available at most pet stores, and their movement triggers prey drive in dragons who might ignore stationary feeders. The drawbacks: they chirp, escape, can bite sleeping dragons overnight, and have a worse Ca:P ratio than dubias. If crickets are your primary feeder, daily calcium dusting is essential. Gut-load them for 24–48 hours before feeding.

Black Soldier Fly Larvae (BSFL) — Excellent Supplement Feeder

BSFL have an exceptional natural Ca:P ratio (around 1.5:1) — one of the few feeders that doesn’t require heavy calcium supplementation. They’re also high in fat, so use them as a supplement feeder rather than a daily staple. Great for boosting nutrition in a gravid female or an underweight dragon.

Mealworms and Superworms — Use Sparingly

Mealworms are high in fat, have a poor Ca:P ratio, and their hard chitin shell is more difficult for juveniles to digest. They’re fine as an occasional treat for adults, but shouldn’t be a staple feeder at any age. Superworms carry the same caveats at a larger size.

Hornworms and Silkworms — Hydration Feeders

Both are high in moisture and low in fat — excellent for hydration and variety. Hornworms are especially useful for a dragon that isn’t drinking well from a bowl. Not nutritional powerhouses on their own, but a solid rotation item that adds variety and contributes to fluid intake.

The Feeder Size Rule

Feeder insects should never be wider than the gap between your bearded dragon’s eyes. Too large, and the insect can press on the spinal cord as it passes through the digestive tract — risking partial paralysis or impaction. This rule applies at every age, not just for hatchlings.

What Never to Feed

• Fireflies / lightning bugs — lucibufagins (the bioluminescent chemical) is toxic to bearded dragons. Even one firefly can be lethal.
• Wild-caught insects — risk of pesticide exposure and parasites. Never feed anything collected from outside.
• Insects from bait shops — not gut-loaded and potentially treated with chemicals not safe for reptiles.

Greens and Vegetables: The Daily Salad

For adult bearded dragons, the salad bowl is the foundation of the diet. The goal is variety within a framework of low-oxalate, low-goitrogen staples. Rotating through multiple greens weekly gives your dragon a broader mineral profile than relying on the same one or two every day.

Everyday Staples

• Collard greens — high calcium, low oxalates. One of the best all-round greens available across Canada year-round.
• Mustard greens — strong calcium profile; peppery flavour that many dragons actively seek out.
• Turnip greens — high calcium, a good rotation addition alongside collard and mustard.
• Dandelion greens — outstanding calcium and vitamin profile. If your yard is pesticide-free and away from roads, fresh dandelion is ideal. Most dragons love the slight bitterness.
• Endive / escarole — good calcium, mild flavour, widely available at most grocery stores.

Good Rotation Greens

• Bok choy — mild and nutritious; contains some goitrogens so shouldn’t be the daily base.
• Arugula — peppery, decent calcium, good variety addition.
• Acorn or butternut squash — high in beta-carotene; offer grated raw or lightly steamed.
• Bell peppers — high in vitamin C; any colour works well and adds visual contrast to the bowl.

Use Sparingly

• Kale — nutritious but high in goitrogens (can suppress thyroid function with chronic feeding) and moderate oxalates. Fine once or twice per week; problematic as a daily staple.
• Spinach — very high oxalates that bind calcium and prevent absorption. Use rarely, if at all.
• Swiss chard and beet tops — high oxalates. Same caution as spinach.

Toxic — Never Feed

• Avocado — toxic (persin content).
• Onion, garlic, leek, chives — toxic; cause oxidative damage to red blood cells.
• Rhubarb — extremely high oxalic acid; can cause kidney failure.
• Wild mushrooms — unpredictable toxicity. Avoid all varieties.

Fruit: Occasional Treats Only

Fruit is the candy of the bearded dragon diet — highly palatable and useful for training, but too high in sugar to feed regularly. Offer small portions (a few blueberries, a slice of strawberry, a small piece of mango or papaya) once or twice per week at most. High-fruit diets have been linked to digestive issues and fatty liver disease in adult dragons. Avoid citrus entirely (too acidic), and avoid grape seeds and apple seeds due to potential toxicity concerns.

Feeding Schedule by Age

This is where most beginner mistakes happen. Generic care articles often suggest schedules suited to adults that, applied to juveniles, produce stunted growth and early bone problems. Here’s the breakdown we apply to Lia and the animals in our care:

Age	Insects	Plants	Feeding Frequency	Calcium Supplement
0–3 months (hatchling)	80–90%	10–20%	3× daily (10–15 min sessions)	Every feeding
3–12 months (juvenile)	70–80%	20–30%	2× daily	Every feeding
12–18 months (sub-adult)	~50%	~50%	Once daily	Once daily
18+ months (adult)	20–30%	70–80%	Insects every 2–3 days; salad daily	5× per week (alternate plain Ca and Ca+D3)

These ratios are by volume, not calories. Insects are calorie-dense; greens are calorie-light. An adult eating 30% insects by volume is still getting a significant share of total daily calories from protein — more than it looks when you see the bowl.

Gut-Loading: Why Your Feeders’ Diet Matters

Gut-loading means feeding your feeder insects nutritious food 24–48 hours before offering them to your dragon. The insect becomes a vehicle for whatever nutrients it’s eaten. A cricket that’s been sitting on plain cardboard delivers almost nothing; a cricket gut-loaded on fresh collard greens, shredded carrot, and a commercial gut-load powder delivers meaningfully more calcium and vitamins with every bite.

Good gut-load foods: leafy greens (collards, mustard greens, dandelion), orange vegetables (carrot, squash), commercial gut-load powder mixes. Provide moisture through sliced orange or potato rather than open water dishes — crickets and roaches drown easily in standing water.

Supplementation: The Protocol That Works

Metabolic bone disease (MBD) is the most common serious health problem in captive bearded dragons, and it’s almost entirely preventable with correct supplementation and UVB access.

1. Calcium without D3 — dust feeders at every feeding for juveniles; 4–5 times per week for adults. This is the base layer of protection against MBD.
2. Calcium with D3 — substitute 2–3 times per week if your beardie doesn’t have strong UVB exposure (T5 HO 10.0 tube covering most of the basking zone). With excellent UVB, reduce to once per week.
3. Reptile multivitamin — once per week to cover trace minerals, vitamin A, and other micronutrients that calcium and D3 supplementation don’t address alone. Vitamin A toxicity from over-supplementation is a real risk, so stick to once weekly.

Hydration

Bearded dragons are from arid Australia and tolerate low moisture well, but dehydration is still a real concern in captivity — particularly for animals that don’t eat high-moisture feeders or fresh greens consistently. Practical hydration methods: lukewarm baths (28–30°C / 82–86°F) for 15–20 minutes one to two times per week (many dragons drink during baths and absorb water through the cloaca); a shallow fresh water bowl in the cool end changed daily; high-moisture feeders like hornworms; light misting 2–3 times per week on enclosure walls for dragons that will drink from surfaces.

Common Feeding Mistakes

• Feeding adult beardies daily insects — adults don’t need daily protein. Excess accumulates as fat and stresses the kidneys over time.
• Using spinach or kale as the daily green — oxalates (spinach) and goitrogens (kale) cause cumulative issues when fed every day. Rotate through the staples list.
• Skipping calcium supplementation — the single fastest route to MBD. Don’t skip even with strong UVB lighting in place.
• Feeders too large for age — the eye-gap rule matters at every stage of life.
• Not gut-loading feeders — 24 hours on good gut-load food makes a real, measurable difference in the nutritional value of each feeding session.

Frequently Asked Questions

How often should I feed my bearded dragon?

Juveniles under 12 months should be fed insects 2–3 times daily with fresh greens available continuously. Sub-adults (12–18 months) move to once-daily feeding. Adults (18+ months) get a fresh salad daily but insects only every 2–3 days. Overfeeding adults is a common mistake — they’ll eat enthusiastically even when they don’t need the calories.

Can bearded dragons eat fruit every day?

No. Fruit is high in sugar and should be offered as an occasional treat — once or twice per week in small amounts. Daily fruit contributes to obesity and digestive issues in adult dragons.

Are mealworms safe for bearded dragons?

Yes, as an occasional treat for adults. Their high fat content and hard chitin shell make them a poor staple feeder, especially for juveniles. Use them sparingly, not as a primary protein source at any age.

My bearded dragon won’t eat greens. What do I do?

Common in juveniles still in their “everything is a bug” phase. Tactics that work: place one live cricket in the salad bowl so they root around and accidentally eat greens; offer greens before insects when they’re hungriest; try different greens (some dragons strongly prefer dandelion over collard, or vice versa); add a small piece of bell pepper for colour contrast. Offer fresh greens every day regardless of whether they eat them — persistence matters more than any single trick.

What’s the best feeder insect in Canada?

Dubia roaches are the best overall choice — superior Ca:P ratio, easy to gut-load, quiet, and contained. They’re legal in Ontario and available from local breeders and online suppliers shipping within the province. Crickets are a solid alternative and more widely available at pet stores, but require more consistent calcium supplementation to compensate for their lower Ca:P ratio.

How do I know if my bearded dragon is eating enough?

Weigh your beardie weekly on a kitchen scale. Juveniles should gain weight steadily through their first year. Adults should maintain a stable, healthy weight — good muscle tone along the shoulders and legs, a plump tail base, and a slightly convex belly profile. Visible hip bones, a sunken tail base, or prolonged inactivity during warm parts of the day are signs worth investigating.

Can bearded dragons eat the same greens every day?

They tolerate repetition but thrive with variety. Rotating through 4–6 different greens over the course of a week ensures a broader mineral profile than feeding collard greens exclusively every day. The same logic applies to feeders — a dubia-and-BSFL rotation consistently outperforms crickets-only on nutritional delivery.

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For the full picture of bearded dragon keeping — housing, UVB, temperatures, handling, and health — our complete bearded dragon care guide covers everything in one place. For a cross-species view of how dietary needs vary between beardies, ball pythons, tortoises, and others, the complete reptile diet guide is worth bookmarking alongside this one.

Thinking About a Bearded Dragon?

A correct diet is cheap once you know it — most beardies that struggle were simply fed wrong, not kept by bad people. If you’re ready for one, check the reptiles currently looking for new homes with us. And if you have a bearded dragon you can no longer care for, we take in surrenders without judgment.

This guide describes general husbandry practices and isn’t a substitute for veterinary care — the Association of Reptile and Amphibian Veterinarians maintains a directory of qualified exotics vets. Reptiles can carry Salmonella even when healthy, so follow Health Canada’s handling and hand-washing guidance, especially around young children.