To put it another way, when people (or animals, for that matter) are losing a lot of weight, whether by eating less, exercising more, or stomach stapling, the body senses that starvation is not far behind. As a protective mechanism, “energy” that is normally available to less essential tasks such as hair growth is re-directed to more essential needs such as preserving muscle.
Hair loss can also be a symptom of certain medical problems such as fungal infection or disorders of the thyroid, pituitary or parathyroid glands. Exposure to some medicines and pesticide also can cause hair loss but are quite rare.
Stress and hormonal changes can also trigger temporary hair loss. Either of these conditions may accompany a weight reduction regime. Because a small amount of estrogen is produced in fatty tissue, some individuals may experience hormonal changes with weight loss. Stress can be a factor as new habits and lifestyle changes are implemented and food is no longer used as a coping mechanism.
It’s normal to lose hair at certain times of the year. You’ll notice it more at some times than others, even when you’re not dieting. If you’re one of the people who tend to have temporary hair loss with dieting, and it’s a time when you’d naturally lose some hair, it will certainly be more noticeable to you.
Lack of protein and vitamin supplementation can be a factor for some individuals during weight loss as can a low fat intake. Digestive enzymes and high-sulfur foods, such as eggs, have also been reported to help. It’s also important to drink adequate amounts of water each day, to keep the body well-hydrated.