Tag: Indigestible protein

Explore our comprehensive collection of health articles in this category.

Does Hair Have Calories? An Investigation into Keratin and Nutrition

Dec 27, 2025 •

4 min read

The average person sheds between 50 and 100 hairs per day. This raises a curious question: does hair have calories? Despite being made of protein, hair provides no nutritional energy for humans because our digestive systems are not equipped to break it down.

The Caloric Conundrum: Do Nails Have Calories?

Oct 4, 2025 •

5 min read

Approximately 30% of the population bites their nails, leading some to wonder if they provide any nutritional value. The short answer to the question, 'do nails have calories?', is no: despite being a type of protein, they are indigestible to humans and provide no usable energy for your body.