There are many people who are a little overweight without really being bothered by it. But being overweight affects your health in the long run. As a result, you run a higher risk of disease and your life expectancy is shorter.
Maybe being a little overweight isn't such a bad thing. Most people don't really notice it at all. But unnoticed, the excess of fat tissue can be harmful. In fact, there is no organ that does not suffer from obesity. Even if you don't notice it right away, the excess fat in your body creates a continuous inflammatory response. This causes damage to tissues: from heart and blood vessels to nerve tissue and liver.
Over time, the risk of getting a disease increases. On average, you live shorter as weight increases. Depending on the severity of the overweight, this can reduce life expectancy by up to 15 years. But more importantly: it makes people less happy. You can measure this with a 'quality of life' score.
The conditions for which overweight and obesity increase the risk.