Build and keep more muscle mass
Do regular strength training
Stay physically active throughout the day
Walk more and sit less
Eat enough protein
Eat enough total calories
Avoid crash dieting
Get enough sleep
Manage stress
Drink enough water
Include high-intensity exercise
Eat regular meals if that helps you avoid overeating
Limit long periods of inactivity
Avoid excessive alcohol
Treat thyroid or other medical issues if present
Be consistent with healthy habits