Nutritionist Ekaterina Yaschenko listed the five most common causes of rapid weight gain.
How often do you have to deal with a situation – a person seems to not allow himself anything extra in food, but the extra weight still does not go away. This is not a simple symptom, and you need to understand what your body is trying to tell you.
“One of the possible reasons is a monotonous and poor diet. Lack of quality food can lead to both weight loss and weight gain. Poor nutrition does not bring pleasure in the process of eating and high-quality saturation, so you can overeat more often, ”says the expert.
The second reason is lack of sleep. You can eat right, exercise as much as you like, but at the same time regularly lack sleep. The weight will increase.
The third problem lies in violations of the thyroid gland. It plays a huge role in the work of the whole organism, controlling the hormonal background and metabolism. Metabolism is disturbed – there will be an increase in the scales.
Stress is a very common culprit of being overweight. It's all about the level of cortisol, which rises with stress. Cortisol provokes jumps in glucose and insulin. The result is a constant desire to eat, a person cannot get enough.
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And the fifth reason is insufficient intake of liquid, water. Many ignore this factor, but it is important. Water is also capable of giving a feeling of fullness, curbing excessive appetite.
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If there is a lack of water, the body will accumulate and retain it, as a result there will be swelling and an increase in body volume. 
Ekaterina Yashchenko Healthy lifestyle Nutritionist