To clear up a potentially major misconception here, you still need to exercise to stay healthy and improve quality of life up to an old age.
Even if exercise does not make you lose weight, you still need exercise for keeping your bones and muscles strong. No miracle diet nor miracle supplements can give you strong bones and strong muscles without exercise.
Having strong bones and muscles helps prevent serious injuries from even minor accidents like bone fracture and helps maintain mobility, independence, vitality and good quality of life up to an old age. Exercise is fundamental to "age-proofing" yourself that is maintaining many physical attributes of youth up to an old age.
Exercise will also boost your "cardiovascular fitness" to a much larger extent possible than diet and other healthy habits alone.
Having strong cardiovascular fitness is key to avoiding Cardio Vascular Disease (CVD) and makes you far more resilient from getting cancer. It will also improve your immune system and even reduce factor that cause aging.
Exercise, together with good diet, good sleep, and healthy thoughts are fundamental to good health and long life. You can't exclude exercise just to make things clear.
