One hundred years ago today Alfred Wegener presented his Continental Drift hypothesis to much derision and scepticism. Alfred Wegener first thought of this idea by noticing that the different large landmasses of the Earth almost fit together like a jigsaw.
BMI readings under 18.5 mean you are underweight, and could put on a few pounds. If you fall between 18.5 and 24.9, youâre considered normal, while a BMI of 30 or higher qualifies as overweight. But in recent years, more researchers argue that itâs not the most accurate way to measure body weight. For years, scientists have said that BMI canât distinguish between fat and muscle, which tends to be heavier and can tip more toned individuals into overweight status, even if their fat levels are low.
Because it's simple, Ahima said, adding that it's easy to weigh people and measure their height. For most people, BMI provides a reasonable measure of body fat, but is not accurate for athletes (who weigh more because of muscle) or older people who have lost height, he said.Other methods of measuring body fat also have their pros and cons. person's BMI is calculated as her weight in kilograms divided by her height in meters, squared. A BMI of 18.5 to 24.9 is considered normal, a BMI of 25 to 29.9 is overweight, and a BMI greater than 30 is obese..