1. The focal plane of the camera lens is not a plane, but a sphere, so it will definitely be a little fatter than before. If you want to look thin, stay away from the camera.

2. Spherical lens will have barrel distortion, but it usually happens in wide-angle lens. If you don't want to be deformed, please don't take a portrait with a wide-angle lens.

3. Wearing black can make you look thin and white and fat.

4. Also pay attention to the shooting angle. It's better to shoot horizontally.