Fill half your plate

People naturally lose muscle after 40, especially women after menopause. Because muscle burns more calories than fat, this can slow down your metabolism and make it harder to shake those stubborn pounds. Strength-training exercises -- lifting weights or doing body-weight exercises, like push-ups and squats -- at least twice a week can help you keep those muscles.

Beer bellies aren’t always caused by booze. But a "spare tire" is common in middle age, and alcohol can have something to do with it. A glass of beer or wine is about 150 calories, and that can add up if you drink often. Plus, alcohol can make you hungry, so you may eat more while you drink.

When you’re busy with work, kids, and life, you can be tempted to grab food on-the-go or multitask through a meal. But you’re more likely to overeat -- and be hungry again soon after -- if you don’t focus on your food. Sit down for meals and tune in to what’s on your plate (not what’s on your TV or computer screen). That helps your brain realize when you’ve had enough.