Just googled 'hair loss and dieting' and it came back with it being caused by nutritional deficiencies. Thyroid issues can also cause it and a blood test will show this result.
"Hair loss occurs when the diet is inadequate in the B vitamins - especially B6, biotin, inositol and folic acid; and the minerals magnesium, sulfur and zinc. The B vitamins, especially B5 (pantothenic acid and B3 (niacin), are especially important for hair growth.
Hope this helps.
Anyone watch 'come dine with me'? The Irish show started last wk and on this weeks lineup one of them is a ww leader so am dying to see what she cooks up, will let ye know