Weight gain occurs during ovulation, but not in the true sense of the word. It is due to the changes in estrogen and progesterone secretion in the body during ovulation, which may lead to water and sodium retention in the body, thus causing weight gain. However, as ovulation ends, the weight will return to normal. If a woman overeats or eats foods high in fat or sugar during ovulation, this may also cause her to gain weight. Therefore, women must pay attention to a reasonable diet during ovulation, to ensure adequate nutrition, but not too much nutrition, otherwise they may become fat. You should also pay attention to not overeating to avoid gaining weight, and not over dieting to avoid malnutrition.