A few days without eating can starve to death generally with personal physical fitness, fat and thin, age, etc., can not be generalized, usually about 15 ~ 30 days.
For young people, due to their own physical quality is better or fatter, do not eat probably can hold about 30 days; for the middle-aged and elderly people, their own physical quality is poorer or the body is thinner and weaker, do not eat probably can hold about 10 ~ 15 days; for children, it may be about a week, due to the inability to eat normally lead to life-threatening. In addition, combined with the different metabolism of the human body, the metabolism of different amounts, there may be differences in time.
Therefore, in addition to developing good dietary and living habits in daily life, proper exercise should be practiced to enhance physical fitness.