Table 2. Dietary information.

	Han	Tibetan 1 (pre-migration)	Tibetan 2 and 3 (post-migration)
Main animal food	Pork, chicken, egg	Yak meat, mutton	Pork, chicken
Frequency of meat consumption	Once per day	2–3 times per day	Once per day
Main vegetable food	Various vegetables	Chinese cabbage, potato, tomato	Various vegetables
Frequency of vegetable consumption	2–3 times per day	Once per day	2–3 times per day
Main fruits food	Various fruits	Apple, banana, orange	Various fruits
Frequency of fruits consumption	Once per day	Once per 2–3 days	Once per day
Staple food	Rice, noodles	Zanba, butter tea	Rice, noodles
Frequency of Staple food consumption	2–3 times per day	2–3 times per day	2–3 times per day