Hey,

How can i avoid excess skin/sag during a period of weight loss (several
months)

Cheers
Bob

Probably won't sag if you aren't losing weight too fast. Skin is elastic and
will shrink with you, unless you manage to lose huge amounts of weight in a
very short period. If the body is what you are concerned about get a good
fitting body stocking of a firm elastic to aid you along the way. I had 8
full term pregnancies and got the flat stomach back after each one. Wore a
girdle for only a couple of weeks after each one. Exercising along the way
helps too. Losing fat can be replaced by healthy larger muscles. Not enough
to take up all the fat that is gone, but overall firmness would look better
with some new muscles.