Do more sports. Walking especially, if possible running. If knee issues then cycling and swimming. Eat regularly but make sure you eat a lot of vegetables and salad. Protein is also desireable, but eat less carbonhydrates (not too many noodles, whitebread, pizza etc.)
I trained hard for a year and ran a marathon and didn't lose a pound even though my BMI was overweight. I love running, but it's no weight loss strategy.
That's all.