Is it normal to eat fingernails?
Mostly.Normal for most people
Swallowing a few fingernail bits while biting your nails is fairly common. It’s not a useful snack, though, and the habit can irritate your fingers or expose you to dirt and germs.
Yes—plenty of people bite their nails and end up swallowing the pieces, sometimes without noticing. It can be a mindless response to boredom, stress, or concentration, rather than a deliberate food choice.
A few small bits are unlikely to cause trouble, but nails can carry dirt and germs, and frequent biting can leave your fingertips sore or damaged. If you want to cut back, keeping nails trimmed or using something else to occupy your hands may help.