A one-kilogram mass is still a one-kilogram mass (as mass is an extrinsic property of the object) but the downward force due to gravity, and therefore its weight, is only one-sixth of what the object would have on Earth. So a man of mass 180 pounds weighs only about 30 pounds-force when visiting the Moon.
Like all fruit, apples contain fructose, and too much of this sugar at a time provides your intestinal bacteria with a substrate in which to ferment, which leads to gas production, bloating and abdominal pain. Apples are a healthy addition to any diet, but too many can lead to digestive issues.
Apples can many nutrients that can provide health benefits. When eating apples try to eat the peel. The peel of an apple contains chromium, a mineral that is important in assisting insulin action. Insulin is the hormone that helps to regulate blood sugars, enabling sugar to be utilized for energy.