Bearded Dragon Diet & Feeding Guide (By Age)

TL;DR: Baby bearded dragons (0–3 months) need 80% live feeder insects fed 3 times daily; adults (18+ months) flip to 20% insects and 80% leafy greens, with insects offered only 3–4 times per week. This ratio flip is the most critical concept in beardie nutrition — feeding adults like babies causes fatty liver disease and premature death. Dust all feeders with calcium at every meal and D3 twice per week; never feed fireflies, avocado, spinach, or rhubarb.

Bearded dragons are unlike almost every other common pet lizard. They are true omnivores — the only widely kept species that requires both live feeder insects and fresh vegetables to thrive. Get the balance right and your beardie will reward you with decades of healthy, active life. Get it wrong and you risk metabolic bone disease (MBD), fatty liver disease, obesity, or organ failure.

This guide breaks down exactly what to feed your bearded dragon at every life stage, which insects and greens are best, how to supplement correctly, and the most common mistakes keepers make.

For the complete care picture, start with our bearded dragon species profile.

Why Diet Is So Critical for Bearded Dragons

Bearded dragons (Pogona vitticeps) are native to the arid scrublands of central Australia, where they opportunistically consume insects, small lizards, flowers, leaves, and fruit. In captivity, we replicate this with a managed diet of feeder insects and fresh greens — but the proportions matter enormously.

The single most important concept in bearded dragon nutrition is that the diet ratio must change with age. Baby beardies need up to 80% of their calories from protein-rich insects to fuel explosive growth. Adult beardies — once their skeletal growth slows — need the opposite: up to 80% of their diet from plant matter, with insects as a supplement. Feeding an adult beardie like a baby is one of the leading causes of obesity and fatty liver disease in this species.

A bearded dragon fed improperly may look healthy for months before problems surface. MBD causes irreversible bone deformities. Fatty liver disease is frequently fatal. Both are almost entirely diet-related and entirely preventable.

Diet by Age — The Most Important Table You Will Read

This is the framework around which everything else in this guide is built. If you take nothing else away, take this:

The transition between stages is gradual. You do not flip a switch on your beardie's 18-month birthday — you slowly shift the ratios week by week as they approach each threshold. Watch body condition as your guide: a healthy beardie has a firm, rounded tail base (not sunken, not bulging with fat), clear eyes, and a smooth, round belly.

Best Feeder Insects — Ranked

Not all insects are created equal. Here is how the most common feeder insects stack up for bearded dragons, from best to acceptable:

1. Dubia Roaches — Best Overall

Dubia roaches are the gold standard feeder for bearded dragons at any age. They offer an exceptional nutritional profile — 23% protein, 7% fat, and a calcium-to-phosphorus ratio of approximately 1:3 — which is the best balance of any commonly available feeder insect. They do not chirp, do not smell significantly, cannot climb smooth glass or plastic, and breed easily in captivity if you want to establish your own colony.

For baby and juvenile beardies, small or medium dubias are ideal. Adults can eat full-grown dubias without issue.

2. Black Soldier Fly Larvae (BSFL) — Best Calcium Content

Black soldier fly larvae (sold as Calciworms, Nutrigrubs, or PhoenixWorms) have a naturally inverted calcium-to-phosphorus ratio of approximately 1.5:1 — meaning they actually deliver more calcium than phosphorus without any supplementation. This makes them exceptional for growing babies and for calcium-conscious adult feeding. They are soft-bodied, highly digestible, and generally accepted well by beardies of all ages.

The main limitation is that they are lower in protein than dubias. Use them as a rotation staple rather than the sole feeder.

3. Crickets — Most Accessible

Crickets are the most widely available feeder insect at virtually every pet store. Protein content is decent (around 21%) and they are an acceptable staple when gut-loaded properly. The downsides are real: crickets are loud, they escape constantly, they have a noticeable smell, and they will bite your beardie if left in the enclosure overnight. Always remove uneaten crickets within 15–20 minutes.

For many keepers, crickets are the default feeder by necessity rather than preference. They work, but dubias or BSFL are better if you can source them.

4. Superworms — Treat Only

Superworms are large, active, and irresistible to most bearded dragons. They are also approximately 18% fat — high enough that overfeeding will contribute to obesity and fatty liver disease in adults. Offer superworms as an enrichment treat 1–2 times per week at most, never as a staple. Not appropriate for babies due to their size and hardened exoskeleton.

5. Hornworms — Hydration Treat

Hornworms are approximately 85% moisture, making them an excellent hydration source during hot months or after illness. They are well accepted by picky eaters and good for encouraging reluctant feeders. Their nutritional profile (9% protein, very low fat) makes them unsuitable as a staple, but as a weekly variety feeder they are excellent.

6. Mealworms — Occasional Only

Mealworms are fine occasionally for adults, but their high chitin content makes them difficult to digest, and they should never be a primary feeder. Avoid completely for babies under 4 months.

Insects to NEVER Feed

• Fireflies / lightning bugs — Contain lucibufagins, cardiotoxic compounds that are lethal to bearded dragons even in tiny amounts. A single firefly can kill a beardie. This is not an exaggeration.
• Wild-caught insects — Unquantifiable pesticide and parasite risk. Never use insects caught outdoors.
• Avocado, rhubarb, or any insect found near those plants — The plants themselves are toxic; treat any insect contact with them as suspect.

For a curated list of tested feeder options, see our best bearded dragon food guide.

Best Greens, Vegetables & Fruits

Daily Staple Greens

The following greens are nutritionally excellent, have favorable calcium-to-phosphorus ratios, and are safe to feed every day:

• Collard greens — High calcium, low oxalates. One of the absolute best daily greens.
• Mustard greens — Strong flavor that many beardies love. High calcium and vitamin A.
• Turnip greens — Excellent calcium source, very low oxalate content.
• Dandelion greens — Highly nutritious. If sourced from an untreated lawn, wash thoroughly.
• Endive / escarole — Slightly bitter, but nutritious and accepted well.
• Butternut squash — Excellent Ca:P ratio, high vitamin A, easy to prepare (raw, grated).
• Acorn squash — Good nutritional profile. Serve raw and grated.
• Bell peppers — High in vitamin C and well accepted. Any color works; red has the most nutrients.

Occasional Greens (2–3 Times Per Week)

• Kale — Nutritious but contains moderate goitrogens and oxalates. Fine in rotation, not daily.
• Bok choy — Good calcium content. Feed a few times per week.
• Green beans — Good filler vegetable with decent nutritional value.
• Arugula — Slightly peppery. Some beardies love it, others ignore it.

Fruits (Treat Only — 1–2 Times Per Week)

Fruits are high in sugar and should be used as enrichment treats, not dietary staples. Safe options include:

• Blueberries
• Mango (remove skin and pit)
• Papaya
• Strawberries
• Raspberries
• Watermelon (occasional, mostly water)

Foods to NEVER Feed

• Avocado — Toxic to bearded dragons. Contains persin, which causes heart failure.
• Rhubarb — Extremely high in oxalic acid. Can cause kidney failure.
• Spinach — Very high oxalate content. Oxalates bind to calcium and prevent absorption, accelerating MBD. Avoid entirely.
• Iceberg lettuce — Nearly zero nutritional value. Up to 96% water with no meaningful vitamins or minerals. Just a waste of feeding opportunity.
• Citrus fruits (lemon, lime, orange, grapefruit) — High acidity disrupts gut flora and causes digestive distress.
• Onions, garlic, chives — Toxic compounds harmful to reptiles.
• Firefly-adjacent plants — If a plant has been near firefly populations in your area, avoid it as a cautionary measure.

Supplements — Non-Negotiable

No matter how well you feed your bearded dragon, the nutritional gap between captive diets and what beardies eat in the wild requires supplementation. This is not optional.

Calcium Without D3

This is your primary daily supplement. Dust insects lightly before every feeding. The goal is a fine coating — not a thick white crust. Too much is wasteful; too little is dangerous.

• Baby/Juvenile: Every insect feeding
• Sub-adult: Every insect feeding
• Adult: Every other insect feeding

Calcium With D3

D3 is essential for calcium metabolism. However, bearded dragons with proper UVB lighting (T5 HO 12% desert lamp at the correct distance) synthesize their own D3 through UVB exposure. This means:

• If you have adequate UVB — use D3 supplement sparingly (once per week or less) as a backup
• If your UVB setup is questionable — increase to 2× per week
• Vitamin D3 is fat-soluble and can be over-supplemented. More is not better.

For everything you need to know about UVB, see our best bearded dragon UVB lights guide.

Multivitamin

A quality reptile multivitamin fills in trace nutrients that feeder insects and greens alone may not provide.

• Babies/Juveniles: 2× per week
• Adults: 1–2× per week

Top options:

• Arcadia EarthPro-A — Highly regarded among experienced keepers. No preformed vitamin A (uses beta-carotene instead), which dramatically reduces overdose risk.
• Repashy Calcium Plus — All-in-one formula that combines calcium, D3, and vitamins in a single dust. Convenient for keepers who prefer a simplified routine.
• Zoo Med ReptiCalcium with D3 — Widely available at pet stores. Solid choice for the calcium-with-D3 slot.

Gut-Loading: Amplifying Every Feeding

Gut-loading means feeding your feeder insects a highly nutritious diet for 24–48 hours before offering them to your bearded dragon. The nutrients in the gut-load transfer through the insect's digestive tract and are then consumed by your beardie — essentially using the insect as a delivery vehicle for extra nutrition.

An insect that has not been gut-loaded is nutritionally hollow. You are handing your dragon an empty calorie.

Best Gut-Load Foods

• Carrots and sweet potato
• Collard greens, mustard greens, and turnip greens
• Butternut squash
• Commercial gut-load formulas (Repashy Bug Burger, Mazuri Hi-Calcium Gut Loading Diet)
• Bee pollen (small amounts — excellent micronutrient profile)

Foods to Avoid for Gut-Loading

• Iceberg lettuce (no nutritional value passes on)
• Citrus fruits (too acidic)
• Dog or cat food (wrong nutrient profile, excess protein)
• Rhubarb or avocado (toxic)

For a complete breakdown of the best commercial options, see our best insect gut-load guide.

Hydration

Bearded dragons evolved in arid environments and have efficient kidneys, but they still need access to water. Here is how most beardies stay hydrated:

• From food — Greens and high-moisture insects like hornworms provide significant hydration. A beardie eating fresh greens daily is getting substantial moisture from their diet.
• Water dish — Offer a shallow, escape-proof water dish. Many beardies will not drink from standing water, but some do. Change it daily regardless.
• Mist greens — Lightly misting fresh greens before serving causes water droplets that beardies readily lick off. This is often more effective than a water dish.
• Lukewarm baths — 15–20 minute baths in shallow (no deeper than your beardie's elbows) lukewarm water 1–2 times per week. Beardies drink during baths and absorb some water through their vent. Also excellent for assisting shedding.

Signs of dehydration: sunken eyes, wrinkled or loose skin, lethargy, infrequent urination, chalky white urates (healthy urates are white; yellow or orange urates signal dehydration or kidney stress).

Common Diet Mistakes (And How to Avoid Them)

Mistake 1: Feeding Adults Too Many Insects

This is the number one dietary mistake in adult bearded dragon care. Adults need 80% plant matter. Continuing to feed 50% or more insects past 18 months leads to protein overload, obesity, and — most seriously — fatty liver disease, which is frequently fatal and difficult to reverse.

If your adult beardie is overweight (fat deposits visible at the tail base, rounded belly, "armpit bubbles"), immediately reduce insect offerings to 2–3 times per week and increase greens.

Mistake 2: Not Enough Variety in Greens

Feeding only one type of green every day creates nutritional gaps. Different greens have different vitamin, mineral, and phytonutrient profiles. Aim for at least 3–4 different greens in rotation. A simple approach: buy a mix of collard greens, mustard greens, and turnip greens and rotate what goes in the bowl each day.

Mistake 3: Skipping Supplements

MBD (metabolic bone disease) is almost always caused by inadequate calcium or vitamin D3. It causes softened, deformed bones — rubber jaw, bowed limbs, spinal kinks — and is irreversible once established. Supplement every feeding for babies. There are no excuses for skipping supplements.

Mistake 4: Feeding Insects That Are Too Large

A universal rule for all reptiles: feeder insects should be no wider than the space between your beardie's eyes. Feeding oversized insects risks impaction (a blockage in the digestive tract that can be fatal) and, in babies, can even cause neurological symptoms from pressure in the gut. When in doubt, go smaller.

Mistake 5: Not Gut-Loading Feeders

Buying crickets from a pet store and feeding them directly to your beardie within hours of purchase means those insects have been starved or fed nutritionally worthless food. Always gut-load for at least 24 hours before feeding. Keep a small tub of carrots, collard greens, and sweet potato available at all times for your feeder colony.

Mistake 6: Relying on Iceberg Lettuce or Spinach

Iceberg lettuce is not food — it is water with fiber. Spinach is actively harmful because its high oxalic acid content binds to calcium in the gut and prevents absorption. Both are commonly sold in grocery stores and given to beardies by well-meaning keepers with poor outcomes.

Putting It All Together — Sample Adult Feeding Day

Here is what a well-structured feeding day looks like for an adult bearded dragon:

Morning: Offer a bowl of fresh mixed greens — collard greens, butternut squash, bell pepper, and mustard greens. Lightly mist with water before serving. Leave available for 2–3 hours.

3–4× per week (insect days): Offer 10–15 appropriately sized dubia roaches or BSFL, dusted with plain calcium powder. On one of these days, also add a pinch of Arcadia EarthPro-A multivitamin.

Weekly bath: 15–20 minutes in shallow lukewarm water. Excellent for hydration and general health.

Ongoing: Monitor body weight and condition monthly. A healthy adult beardie should be firm, alert, and maintain consistent weight. Any sudden weight loss warrants a vet visit.

For a full setup guide including lighting and temperature — critical for digestion — see our bearded dragon tank setup guide. And for top-rated commercial food options reviewed by our team, see our best bearded dragon food guide.

Looking for healthy treat ideas? Our top 3 healthy snacks for bearded dragons rounds up the best options for enrichment feeding.