Losing weight is a long-term project, which requires hard work and effort. A healthy way to lose weight is to keep your mouth shut and open your legs. Find a reasonable diet and exercise that suits you, integrate into life, step by step, and persist for a long time. As for happiness or unhappiness, it depends on your state of mind. If you are calm, put health first, develop good eating and exercise habits, and integrate into life, you will feel happy.