Loss of muscle: Like our metabolisms, we also start to lose muscle when we hit our 40s, experiencing a steady decline each decade. Part of this, scientists believe, is that the motor units that make up our muscles decline as we age and that those motor units don't always fire with the same regularity. However, the important takeaway here is this: The biggest factor in losing muscle is the lack of physical activity, which makes exercise a crucial component when it comes to preventing muscle loss.

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Adding interval training — bursts of high-intensity moves — to your workout is a great metabolism booster. "Studies have shown that people who do interval training twice a week [in addition to cardio] lose twice as much weight as those who do just a regular cardio workout," says obesity specialist Aronne. You can easily incorporate interval training into your workout by inserting a 30-second sprint into your jog every five minutes or by adding a one-minute incline walk to your treadmill workout. "Since your body is working harder, it's a more intense workout -- and you therefore burn more calories," says Westcott. On other days, shake up your routine with 40 minutes of cross-training. Ideally, aim for two 20-to-40-minute interval-training sessions and two 20-to-40-minute cross-training sessions a week.

Research shows that getting plenty of protein can boost your metabolism, causing you to burn an extra 150 to 200 calories a day, says Jeff Hampl, Ph.D., R.D., a spokesman for the American Dietetic Association. "Protein is made up mainly of amino acids, which are harder for your body to break down [than fat and carbs], so you burn more calories getting rid of them," he explains.
Want to maximize your fat-burning potential after 40? Start by making sure you’re getting plenty of calcium in your diet. The results of a study conducted at the University of Tennessee, Knoxville reveal that obese women who consumed more calcium lost 11 pounds of body fat in over a 12-month period. Even better, increasing your calcium intake can help increase the strength of your bones, reducing your risk of a fall or fracture.

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Everyone’s favourite funny woman, Leslie Mann is undeniably gorgeous. With those messy curls, ear to ear grin and infectious sense of humour, how could she not be? She has starred in The 40-Year-Old Virgin, Knocked Up, How To Be Single and the 2018 film, Blockers. Most of Leslie’s credentials are movies produced by hubby, Judd Apatow. Leslie is 46 years old and has two children.

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