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IF THE NUMBER on the scales is heading skywards with every extra candle on your birthday cake, you’re not imagining things. Even the most dedicated fitness buff can’t completely sidestep the physiological changes that come with growing older. As you age, your body becomes inefficient at processes it once excelled at, says Joe Mitton, a physical therapist in the UK. That’s why it suddenly may seem harder to shed weight than it did before. Some people accept the extra few pounds. But keeping your weight in check and your muscles strong can help you lower your disease risk and protect your body from injury, so you can stay active and healthy for years to come. Here are four things that may be affecting your weight as you age—and how to fight back against them.