If your appetite increases you probably won't have to eat less, just differently. There's something wrong with my glands Genuine medical conditions that cause weight gain are very rare. They include hypothyroidism, in which the thyroid gland does not produce enough thyroxin to keep the metabolic rate high enough. Symptoms include feeling cold, tired all the time, experiencing weight gain and constipation. See your doctor if you suspect that you have thyroid problems.
Fluid retention can also show itself as an increase in weight.
Or it may be caused by medicinal drugs, including corticosteroids and oral contraceptives, or a more serious underlying problem such as heart or kidney disease. See your doctor. Everyone puts on weight as they get older Weight gain with age is not inevitable. It is usually a consequence of continuing to eat the same amount while being less active. It can also be the result of consistently over-eating, even by just a small amount, over the years.