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Secrets to firing up your metabolism

Not happy with the metabolism you've got? These strategies - for mealtime, gym time, downtime and bedtime - will help you burn more calories all day long.

Pick Protein: Protein is the building block of muscle. The more lean muscle you have, the more calories you expend. Your muscles can use only 30 grammes of protein at any time. Any more than that gets stored as fat. Aim for a minimum of 46 g of protein per day. A sample menu:

Breakfast: 6 ounces lowfat yogurt with 1/2 cup berries and a medium skim latte (23 g)
Lunch: Spinach salad with 2 oz chicken and 1/3 cup black beans, served with pita with 2 tbsp hummus (30 g)
Dinner: Asian stir-fry with 1/3 cup each tofu, snow peas, red bell peppers, bok choy, bean sprouts and 3/4 cup brown rice, sprinkled with 2 tbsp slivered almonds (23 g)

Soothe your stress: It's impossible to live in a worry-free bubble, but constant anxiety can cause your adrenal gland to pump out too much cortisol. High levels of the stress hormone change how your metabolism stores fat, sending flab to the belly, where it affects vital organs. Yoga can reduce stress by signaling to your brain to lower cortisol levels. There's evidence that meditation and tai chi may have the same effect. To find your version of Zen-ercise, sign up for group-buying sites to get deals on classes. Pick your favourite and make it a regular habit.

Be a cardio king or queen: Just one 45-minute high-intensity workout can help increase your RMR (resting metabolic rate) by 37 per cent for up to 14 hours post-exercise. A vigorous workout raises your internal temperature, creates some inflammation and depletes your energy stores. Afterward, it takes extra energy for your body to bounce back to its normal resting state. Intervals are great for upping calorie burn during your workout, but to keep metabolism high hours after you've left the gym, you need to exercise once or twice a week for 45 minutes at a steady level that makes it difficult to converse (about a seven on a scale of one to 10, 10 being the hardest you could go). Relax after the tough workout, and revel as you burn nearly 200 more calories from your couch.

Sculpt lean muscle: As you age, you start to lose some muscle mass. Lifting weights helps you maintain and build on what you have, so your metabolism stays high. Two or three times a week, finish your calorie-zapping cardio sessions with 15 to 30 minutes of strength training. Perform 12 to 20 reps of moves that engage as many muscles as possible, such as squats, planks, lunges and push-ups. You'll get higher muscle activation and calorie burning with this strategy.

Clock your snooze: As few as two sleepless nights can mess with your metabolism - increasing levels of the hormone ghrelin, which stimulates hunger, and decreasing levels of the hormone leptin, which tells you to stop munching. Research also notes that sleep debt causes insulin resistance, interfering with how your metabolism processes fat and leading to weight gain. Seven to eight hours of sleep per night is considered the sweet spot.

Fill up on plants: The fiber in produce helps stabilise blood sugar levels, keeping your metabolism humming. Plus, the antioxidants in fruit and vegetables help your body get rid of free radicals. Free radicals can harm healthy cells - cells your body needs to keep your metabolism going strong. Unwanted pounds and health complications can result. Aim for 25 g to 30 g of fiber per day. To get the most benefit for your calories, load up your plate with these 10 foods, which, in addition to having fiber, Norwegian researchers have found are high scorers when it comes to antioxidant capacity: walnuts, pecans, sunflower seeds, dark chocolate, blackberries, cranberries, boiled artichokes, dried apricots, curly kale and red cabbage.

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