Humans, of course, are not lab animals. will a very low-calorie
diet give humans the same health benefits as lab animals? Scientists
are beginning to study the effects of calorie restriction on humans,
too. In one study. scientists studied two groups of people for three
years. In the first group, people ate a normal diet. They consumed
between 2,000 and 3,500 calories a day. In the second group. people
ate a healthy, low-calorie diet. They consumed only 1,000 to 2,000
calories a day. After three years,the people in the second group were
significantly healthier. they had lowered their risk of diabetes and
heart disease.