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Showing posts with the label weight

Is the Earth's gravity same everywhere?

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Earth's gravity measured by NASA's GRACE mission, showing deviations from the theoretical gravity of an idealized smooth Earth. (Photo credit: Wikipedia)When you drop something, it falls downwards towards the ground. Why does it fall down? Why not up? All such questions were answered with a 7 lettered word-GRAVITY. Gravity is an attractive force and is stronger on Earth as compared to our Moon due to larger mass. When you drop an object it falls towards the ground and when it is dropped from a greater height it falls towards the ground with greater speed and impact. The greater impact and speed is attributed to acceleration (the rate of change of speed) which is higher due to gravity.
The force of gravity is inversely proportional to the radius of the Earth, that's what our textbooks said in school. But a recent press release from the European Space Agency, showed that the shape of the Earth is not a perfect sphere but a geoid or ellipsoid, bulging slightly at the equator a…

Leptin can help you lose weight?

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Leptin is a small hormone produced by the adipose tissues (fat cells) in our body and functions as a signal for the amount of fat present in the body. Depending on the 'Leptin' signal received, the brain can instruct our stomach to stop demanding food or our mouth to stop eating, thereby reducing food intake. So, in theory, more the amount of leptin in your body, lesser will you eat and it would be a a breeze to keep your weight in control. Of course, there is a catch.
The effect of Leptin was discovered in 1994 in a study involving voraciously eating obese mice. When these mice were given leptin injections, their craving for food dropped and they returned to normal body weight. So, scientists attempted to cure obesity in humans with the help of leptin injections. But, during trials, large amounts and frequent doses of leptin had to be injected to gain significant weight loss in highly obese patients. Also, large doses resulted in redness of skin at the site of injection for c…