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.
More news on apples. GMOs invade fruit industry: Apples, pears, cherries and peaches to all become unlabeled GMO. An apple a day keeps the doctor away (and makes you svelte, smart and strong too). Eating organic apples is a healthy, natural way to stimulate weight loss.