Many people are often surprised by their unexplained weight gain. At times, people with active lifestyles following a healthy diet also tend put on weight. While an unhealthy diet and a sedentary lifestyle are blamed, it could also be the result of certain medical conditions. But overweight people need not lose heart since these conditions can be easily treated.

Medical reasons behind weight gain
a. People with hypothyroidism often put on weight fast as this condition slows down the metabolic rate.
b. Women suffering from Polycystic ovary syndrome are also prone to weight gain in the abdomen area. Besides causing hormonal imbalance in the body, this condition also makes a person resistant to insulin.
c. Hypercortisolism is another condition where a person accumulates a lot of the hormone cortisol in the adrenal glands. This leads to weight gain in the upper body and around the face and neck area.
d. People on oral contraceptives also tend to put on weight.
e. Corticosteroids used for treating rheumatoid arthritis increase appetite and thereby causes weight gain in the abdomen, the arms or legs. It also makes the face rounder.
f. People on antidepressants face the problem of gaining weight since it is also an appetite stimulant.
g. Estrogen causes water retention so that a person looks heavier.