How can premature greying of hair be prevented? any diet?

Cannot: It cannot be prevented. Consider either (1) that it can be beautiful in a young woman, or (2) use hair dye.

Nutrition may help: if there is a specific nutritional deficiency that is the cause. First thing to know is that genetics plays the biggest role in early graying- we can't change our genetics. To reduce risks of early graying & hair loss: 1. Don't Smoke. 2. Correct Zinc, Vit B or other nutritional deficiencies. Vegans are at risk for Vit B12 deficiencies. 3. Ensure that your thyroid is healthy. 4. Diets> Eggs are