Fifty-five percent of Americans are overweight, and 20 percent of them are considered obese, meaning that they have a body-mass index (weight to height ratio) of 30 or higher. The prevalence of obesity in the country has increased by about 50 percent in the past decade. Similar trends have been reported in other developed countries too. Obesity can increase the risk of coronary heart disease, diabetes, stroke, high cholesterol, and high blood pressure.
Several studies have shown that you only have to lose a few pounds in order to see immediate, positive results in your cholesterol, blood pressure and insulin levels. At the University of California, Los Angeles, researchers put 11 obese men on a very low-fat, high-fiber diet, with daily 45-to-60- minute walks on treadmills. After three weeks, the men only lost a few pounds, but their cholesterol levels plummeted 19 percent and their insulin levels dropped by nearly 50 percent. Several men who entered the study with high blood pressure left with normal readings.