As you get older, there's no denying that it becomes increasingly harder to lose weight. That's because we lose muscle mass at an average rate of three to five percent for every 10 years after age 35. This can impact the way your body burns fat.

“Your body goes into its aging stage as it leaves the growing one,” says weight loss and management specialist Dr Luiza Petre. “When this happens, your body doesn’t need as much energy as it used to,” Dr Petre explains.

Why it's so hard to lose weight after 40

What's more, those years of playing sports, sitting, walking up and down stairs, and moving, in general, take their toll on joints and muscles. You may notice that your joints are a little stiffer and sorer than they were a few decades ago. Then, there's the issue of your ever-slowing metabolism.

Your resting metabolic rate, aka your body's ability to burn kilojoules while doing nothing, decreases by about one to two percent per decade due to muscle mass loss and increased fat mass. To add insult to pudge-boosting injury, your diets often don't change enough to account for this metabolic slow-down, meaning weight can creep up slowly but surely with every birthday.

"There are a number of roadblocks people in their 40s will face when trying to lose weight," says personal trainer Brian Durbin. "But once you know what they are - and how to work around them - it's easy to be successful at dropping kilos."

While it’s not impossible to lose weight after 40, the methods you used in your 20s or 30s are not going to work the same way. Follow these tips to help you drop the kilos - and keep them off for good - courtesy of some of the world’s best weight-loss experts, dietitians, and personal trainers

© Prevention Australia