Zora,

Some food for thought.

Three things might be going on besides the 'stress' of dieting.

1) You aren't getting enough carbohydrates to supply all the glucose needed by brain, nerve and red blood cells. If your protein intake is not high enough, certain amino acids are then pulled from non-essential cells (mostly hair, skin, nails, and muscles) to be changed to glucose by your liver and sent into your blood. Remember, fatty acids from stored or dietary fats can be changed to energy that can be used by most cells, but not by brain, nerve, or red blood cells. Remedy: Increase carb intake.

2) An increase in animal fat intake can supply more cholesterol, which may increase your testosterone production. An enzyme produced in the prostate, adrenal glands, and by the hair follicles -- 5-alpha reductase -- changes testosterone to dihydrotestosterone (DHT). A low blood glucose level stimulates your adrenal glands.
DHT shrinks your hair follicles so new hairs are baby-like -- shorter, thinner, less firmly attached to your scalp -- or kills them.
Remedy: Saw palmetto, an herb shown to prevent conversion of testosterone to DHT. Make sure your blood glucose level remains normal.

3) An increased intake of animal fat causes sebaceous glands to increase production of sebum. In your scalp, these oil glands release oil directly into the shaft portion of the hair follicle. The extra oil can clog the follicle and cause it to swell, reducing blood flow (and oxygen and nutrients carried in blood) to it. The swelling may also cause more 5-alpha reductase to be made by the hair follicle, meaning more DHT.
Remedy: If your hair feels or looks more oily, shampoo daily. Don't apply conditioner, hair spray, etc. Use children's spray-on hair detangler, instead.

Hope this helps.