You know that choosing the right types of fats is key, and here's why: Unhealthy fats, found in processed foods, meats, and cheeses, feed the type of bacteria that spark inflammation and cue your body to store fat, says Lipman. But healthy fats high in omega 3s and 6s — like those in avocado, nuts, olive oil, and salmon — do the opposite. They provide long-burning energy by regulating how quickly glucose enters your cells, keeping hunger at bay. Top a sandwich with mashed avocado, or make a summery side salad with chopped avocado, cherry tomatoes, basil, and lemon juice.
Nuts have a very high satiety power—meaning they make you feel fuller after eating than many other foods. And even though they’re high in calories, those calories appear to be processed differently in the body. University of Michigan researchers found that men who added 500 calories’ worth of peanuts a day to their diet gained no excess weight at all.
Every time you complete 10 reps on the rowing machine, lift the handles straight up over your head—without bending your elbows—for two consecutive repetitions before returning to normal rowing form. This works your shoulders and back harder, as well as your legs, since they have to produce more power to give you the momentum to perform the move, says McGarr.

Yes, all couples fight. But it's the ones that know how to work through their disagreements that have better marriages…and better bodies. "Research has shown that cortisol, the hormone that's released during stressful activity, is linked to fat storage. And poor communication between couples is the most common type of stress that you tend to experience," says Gina Guddet, couples counselor and co-author of Love Metabolism. "I see it all the time: one partner says something that makes the other feel disrespected, the other responds defensively and, before you know it, stress levels are through the roof." As soon as you start that fight, Guddat says your body responds with the flight-or-fight mechanism, so it hangs onto fat. To counteract that, she says to nip the argument in the bud as soon as possible. If it can't be resolved quickly, take a "time out" so both of you can literally leave the room to cool off for at least 20 minutes. Doing so allows your heart rate and blood pressure to return to normal, helping your cortisol levels drop so your body shifts out of that fat-storing situation.
Most of the bacteria that dwell in your gut are pretty useful. They produce hormones, regulate your immune system, digest food, extract nutrients, control your mood, manage your appetite, and much more besides. That obese people tend to have higher numbers of Firmicutes bacteria is no coincidence – according to research published in the online journal Nature, these bacteria increase the number of calories your body absorbs from food.
You know you're supposed to eat more protein to lose weight, but you might not know exactly why. Well, it actually has to do with how your body handles insulin. "Your body starts to produce more insulin as you age, since your muscle and fat cells aren't responding to it properly," explains Louis Aronne, M.D., director of the obesity clinic at Cornell University.
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