Some suggest that people on a diet are healthier than those not on a diet because they are less likely to suffer from heart disease, obesity, and diabetes. However, some have argued that those on a diet are healthier, not because they are on a diet, but because they are more likely to exercise than those on no diet at all. In addition, individuals on a diet are more likely to suffer from protein or fiber deficiencies because the diet restricts the variety of food they eat. Which one of the following conclusions is best supported by the passage above? 1. Those on a diet are healthier than those not on a diet. 2. People not on a diet are healthier than those on a diet. 3. Those on a diet are not necessarily healthier than those not on a diet.