Many things could cause significant or rapid weight loss. Some are....
*Diet and exercise
*Stress
*Eating Disorder
*Illness, thyroid condition
*Taking up a new sport / exercise
Maybe. It depends on the person. A set of scales would solve your question better than guesswork.
If a person is not taking in enough calories, and is losing weight, they are losing muscle mass. They may not be getting enough in their high-protein diet.
No- why would you??
Losing weight on any diet really depends on how much weight and you watch what you eat, i would say a typical person will lost about 1-2lbs a week that is on any diet
Impossible, actually. Once you're anorexic you are going to keep losing weight, until you are the most anorexic you can be, and then you'll eventually die. Why would you want to be anorexic without losing weight? Isn't that the whole POINT of anorexia?
Pilates was originally aimed to provide rehabilitation. Though it can contribute to weight loss, Pilates are not specialized for losing weight. Pilates can help you get in shape, but it would be best to look elsewhere for pure weight loss.
If the animal is eating regularly and it is still losing weight, you should probably take it to the veterinarian as it should not be losing weight. Otherwise, it depends on the animal. Most pets, particularly cats and dogs, gain weight when they are fed more cat or dog food.
Losing weight would be the easiest way.
They would probably have no effect at all.
There are many ways to lose weight rapidly, most of them are not safe and usually involve taking some form of diet aid. A safer option would be to cut out junk food and soda, eliminating processed foods and most carbohydrate will help one to lose a lot of water weight and bloating in the first few weeks.
That sounds like a really weird desire. Losing weight on legs would be through losing some weight all over, and not doing any strenght building exercises for the legs. For gaining weight on stomach I have no idea, unless you can get pregnant.
Yes. If you are working out and gaining muscle tone, then it is reasonable that you may gain a little weight (a few pounds) or not lose as much weight as you normally would have if you were just losing "fat" weight. It is good that you are losing fat! In addition, you may be putting on some water weight as your body adjusts. This will go away completely within a few weeks or so. If this is not the case, and you are losing "fat" but still gaining weight, you may want to see a nutritionist or doctor to find out why that would be happening. Absent of that, there is nothing wrong with gaining a few pounds of muscle as you lose fat.