Eat more protein, eat less fat. This is the general formula to complete your task. Also, eat carbs (fruits, vegetables, pasta-- all without butter or oil) for quick energy. Exercise: Aerobics will cause you to look thinner, free weights and weight machines will build bulk. The middle ground will make you lean and hard: pushups, situps, chinups. You can also try Isometrics, which will build up mass without making you lithe. Whatever you do, be careful when you first start exercising, and take it easy on yourself. The point is to be fit, not to kill yourself.
Liposuction. Seriously, this is controversial in the medical community. Many doctors claim you NEVER lose fat cells, the cells themselves only become smaller. Thus, if you develop a large number of fat cells in early childhood, you will probably struggle with weight all your life.
You burn fat before you burn muscle tissue
Every diet involves you losing a little muscle, but the muscle you lose is far less than the fat you will lose. To ensure healthy muscles while you diet, you need to do strength training to maintain muscles. You also need to eat food that contains protein and keep hydrated!
Only by losing weight in general. You can't spot treat fat zones. Cardio will help burn calories without gaining muscle, though.
If you have lots of muscle, why would you be concenred with losing it?
You can lose your memory from becoming old or from losing to much white brain cells.
Losing brain cells is a natural part of aging. Anytime you lose brain cells early on, or as the result of injury.. it can be a bad thing.
It's the same as mental ability, use it or lose it.
If the weight you are losing is muscle, yes.
Eat less fat and sugar. A variety of proteins and carbs as well as vegetables and fruit in your daily food intake will give you a perfect balance of nutrition, you will lose fat and as long as you exercise daily you will lose no muscle tone at all.
Yes if you are meaning height.
No because the muscles need protein to grow or maintain themselves, if you are not getting protein they can't maintain a constant size or grow more and will lose bulk.