When other people want to lose weight, it's not wrong if you want to know how to make the body become fuller. Gaining weight is not an easy matter for those of you who have a thin body. Having a body too thin is not always fun. This can be a problem if the cause is lack of nutrition or certain diseases. Not to mention, if you view these conditions can worsen when you, especially women, are pregnant. However, there are healthy ways you can take so that you can gain weight. First Check Your Health The best way to gain weight depends on what causes you to lose or lose weight. So before starting a weight gain program, first check whether your weight is below normal weight by calculating your body mass index. If indeed you are underweight, you may need medical attention. Some conditions that can cause your body weight to decrease from normal include: Hyperthyroidism or overactive thyroid gland. Celiac disease that makes the body unable to absorb certain nutrients from food.