Intermittent fasting is the hot ticket. You don't have to change WHAT you eat, just WHEN you eat! I'm really down to one big meal a day now, and I'm fine with it. In the beginning though, it's a bitch!!! Who knew, eating a pint of ice cream before you go to bed every night, is bad for you! lol
Exercise, get to walking. Get a sports watch and try and get 10k steps in every day. Your body needs it!!!
Was talking to my daughter this weekend (she's pre med) and she was saying the body STOPS building, supporting, and maintaining muscle mass on its own, after 30. So? You HAVE to hit the weights as well.
Eat right, exercise and adequate sleep. Wanna dig deeper? Watch this series on LONGIVITY by Chris Hemsworth. I bought the book his doctor wrote and listen to it while I'm driving. Good stuff.