What Do Moths Actually Eat?
The answer to "what do moths eat?" depends heavily on two things: the species of moth and the stage of its life cycle. Most people associate moths with chewed sweaters or raided pantries — but the full picture of moth feeding behavior is far more nuanced and fascinating.
Larvae vs. Adults: Two Very Different Diets
One of the most important distinctions in moth feeding is between larvae (caterpillars) and adult moths. These two stages have almost entirely different diets.
What Moth Larvae Eat
Moth larvae are the destructive feeders. The larval stage is when moths cause almost all of the damage we associate with infestations. Depending on the species, larvae consume:
- Keratin-rich fabrics — wool, cashmere, silk, fur, and feathers (clothes moth larvae)
- Stored dry goods — flour, grains, cereals, nuts, dried fruit, and spices (pantry moth larvae)
- Living plant matter — leaves, stems, and roots (many outdoor moth species)
- Wood and bark — certain species like the clearwing moth bore into tree trunks
- Lichens and fungi — some specialized species feed on these
What Adult Moths Eat
Adult moths have a much more limited diet. Many adult moths do not eat at all — they live entirely off energy stored during the larval stage. Those that do feed typically consume:
- Flower nectar (many outdoor species are important pollinators)
- Fruit juices and plant sap
- Moisture from puddles or dew
- Rotting organic matter
Adults that don't eat include the well-known Tineola bisselliella (common clothes moth) and the luna moth. Their sole adult purpose is to reproduce.
The Most Damaging Moth Diets at Home
| Moth Type | What They Eat | Where Found |
|---|---|---|
| Clothes Moth (larvae) | Wool, silk, cashmere, fur, feathers | Wardrobes, closets, storage boxes |
| Pantry Moth (larvae) | Flour, grains, cereal, dried fruit, nuts | Kitchen cupboards, pantries |
| Brown House Moth (larvae) | Feathers, hair, dried plant matter, grain | Throughout the home |
| Tapestry Moth (larvae) | Wool tapestries, upholstered furniture | Living rooms, museums |
Why Do Moths Eat Fabric?
Clothes moth larvae eat fabric not for the fiber itself, but for keratin — a protein found in animal-based materials. Keratin is also found in human hair and skin cells left on garments, which is why worn, unwashed clothing is especially attractive to them. Synthetic fabrics like polyester and nylon are generally safe unless blended with natural fibers.
Why Do Moths Invade Pantries?
Pantry moth larvae (most commonly the Indian meal moth) are attracted to starchy, high-carbohydrate foods. They can chew through thin plastic bags and cardboard packaging, making even sealed goods vulnerable. Once inside, larvae spin silky webbing through the food — a key sign of infestation.
Key Takeaways
- It's almost always larvae, not adults, that cause feeding damage.
- Many adult moths don't eat at all during their short lifespan.
- The type of damage tells you which moth species you're dealing with.
- Natural, protein-rich materials attract clothes moths; starchy dry goods attract pantry moths.
Understanding what moths eat is the first step toward effective prevention. Once you know what they're after, you can protect those exact items in your home.