Final answer:
Hair loss, also known as shedding, can occur due to hormonal or dietary changes, the aging process, and a lack of protein in the diet.
Step-by-step explanation:
Hair loss, also known as shedding, can occur due to various reasons. One possible cause is hormonal or dietary changes, where if more hair is shed than what is replaced, hair loss can occur. Another cause is the aging process and the influence of hormones. A lack of protein in the diet can also lead to hair loss because protein is essential for hair growth and maintenance.