Sugar is a source of calories, not nutrients. Consuming too much sugar can lead to weight gain and tooth decay. Contrary to what many people think, there is no evidence linking high-sugar diets to hyperactivity or diabetes. However, high-fructose corn syrup, found in most processed foods, is linked with obesity, and obesity increases your risk for developing diabetes and other conditions.
Folate is most important for women of childbearing age. If you plan to have children some day, think of folate now. Folate is a B vitamin needed both before and during pregnancy and can help reduce risk of certain serious common neural tube birth defects (which affect the brain and spinal chord). Women ages 15-45 should include folate in their diet to reduce the risk for birth defects if one becomes pregnant, even if one is not planning a pregnancy.
If you count calories, count fat calories, too. Food labels indicate how many calories come from fat, both in actual grams and in percentages. This helps you assess the percentage of fat in your diet. If the total number of fat calories is 30 percent or more of the total calories you consume in a day, you probably need to cut back. But don't be misled by terms like "lower fat." Ask yourself "lower than what?" and look at the overall percentage of fat calories in the food.
It doesn't matter how many pushups you can do in a minute if you're not doing a single one correctly. “There is no point in performing any exercise without proper form,” says Stokes, who recommends thinking in terms of progression: Perfect your technique, then later add weight and/or speed. This is especially important if your workout calls for performing “as many reps as possible” during a set amount of time. Choose quality over quantity, and you can stay injury-free.
Trimming some fat may eliminate some guilt, but be warned: Buying foods labeled “low-fat,” “non-fat,” or “fat-free” may encourage you to eat up to 50 percent more calories, according to three studies by Cornell University’s Food and Brand Lab. Fat’s not the issue when it comes your weight since most of these foods only have about 15 percent fewer calories than their regular counterparts. Go for the full-fat version and eat less—you probably will naturally since they taste better.

Even if you are the most independent exerciser around, give a group fitness class a shot at least once a week—you may find that you enjoy it more than sweating solo. “Happiness and health are shared through social connectedness and closeness,” says Greg Chertok, director of sport psychology at the Physical Medicine and Rehabilitation Center in New Jersey. “Geography and proximity are predictors of how contagious emotions can be, and this may translate into an athletic environment too.” Sign up for Bikram, CrossFit, spin, or Zumba, and you could find yourself—gasp!—smiling at the gym thanks to your classmates.
Fats contain both saturated and unsaturated (monounsaturated and polyunsaturated) fatty acids. Saturated fat raises blood cholesterol more than unsaturated fat, which may even help lower harmful cholesterol. Reducing saturated fat (most comes from meat, dairy and bakery products) to less than seven percent of total daily calories may help you reduce your cholesterol level. Whenever possible, replace saturated fat with monounsaturated and polyunsaturated fats.
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