Exercising at lower intensities will use more fat for energy. This basic premise is what started the theory of the fat burning zone, which is the idea that working in a certain heart rate zone (around 55 to 65 percent of your maximum heart rate) will allow your body to burn more fat. Over the years, this theory has become so ingrained in our exercise experience that we see it touted in books, charts, websites, magazines, and even on cardio machines at the gym.
If you’re logging just a few hours of sleep a night, you may actually find yourself gaining weight. Researchers at the University of Chicago Medical Center found that subjects who slept just four hours had a harder time processing carbs. "When you're exhausted, your body lacks the energy to do its normal day-to-day functions, which includes burning calories efficiently," says Talbott.
Also, while your menstrual cycle may not affect weight gain or loss, losing or gaining weight can affect your menstrual cycle. Women who lose too much weight or lose weight too quickly may stop having a period, or have irregular periods. Women who have obesity may also have irregular periods. A regular period is a sign of good health. Reaching a healthy weight can help women who have irregular periods to have cycles that are more regular. Learn more in our Menstrual Cycle section.

Sugary treats, while obviously delicious, aren’t very good for our bodies—and that includes our tummies. Not only do the added calories add inches to our waistlines, but sugar overload leads to insulin resistance, which tells the body to store extra fat around the waist. But that’s long-term stuff. Sugar also bloats your tummy in the short-term by feeding the bad bacteria in your gut, leading to extra gas. When it comes to flattening your belly, nixing sugar is one of the best things you can do including these 42 other easy tips to lose weight fast!
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