Have a regular meal schedule
In general, diet plays an enormous role in keeping the body healthy. Eating regularly is one of the most important elements in the prevention of excessive calorie consumption and weight gaining.
Consuming four or five smaller meals in roughly the same hours every day is healthier than eating two or three large meals a day, mainly because it avoids a significant increase in blood sugar level after big meals. That has a huge impact on the prevention of weight gain, therefore weakening the immune system.