People get fat regardless of age, and now even children have a high percentage of obesity, which has never been observed before. When doctors in children establish fatty liver disease (fatty hepatosis) - this indicates that all civilized humanity is in a terrible state.
The reason for this is a decrease in physical activity

High carbohydrate content in food

Increasing food volumes

With age, all this accumulates and increases the aging of the body. For example, less testosterone is produced, men become more passive, and they exercise less often. Caloric intake increases and fat begins to accumulate.

But don't talk about 30 years as a milestone. The problem is relevant for absolutely all ages. Now teenagers are less active than old people in the 60s, and the calories obtained from food have doubled.failures'. Avoid carbonated drinks, alcohol, fat, fried, sweet, flour, etc. in your diet. The diet should be dominated by proteins and complex carbohydrates. Diets that promise rapid weight loss are usually effective, but only for a short time, because the weight lost is quickly returned.

Therefore, if you need to lose more than 5-6 kg, it is better to choose the right diet and gradually lose weight. Choose the physical activities that are suitable for you, it can be running, swimming, fitness, yoga or something else. The main thing is to start gradually, so as not to harm the joints and muscles. If possible, you can add massages and wraps so that weight loss does not affect the skin and avoid stretch marks. I recently wrote this article about rapid weight loss.