Meet Staci: Your New Powerlifting Super Hero | Nerd Fitness
you do not want to lose muscle. actually that answers your second question, the reason the folks you see dont have sagging skin after losing fat is because they have maintained or increased their lean body mass (muscle)
as for #3 i avoid fruit since im trying to lose a bunch of weight some people do ok with it though
i found this list that might help
High Fructose foods:
Apple, Mango, pear, peach (yellow), sugar snap peas, watermelon, honey, fructose/fructose syrup.
High Fructose Loads:
fruit juice, dried fruit, tinned fruit in natural juice, larges serves of tomato or concentrated sauces.
Polyols (sorbitol & manitol):
Apple, apricot, blackberry, cherry, lychee, nashi pears, nectarine, pears, plum/prune, watermelon, avocado, snow peas, cauliflower, mushroom, artificially sweetened gums/mints, some low sugar products.
Fructans:
asparagus, artichoke (globe 7 jerusalem), beetroot, broccoli, brussel sprouts, cabbage, fennel, garlic, leek, okra, onion (white, red, shallots, white section of spring onion, and powder), peas, peach(white), watermelon, wheat, rye, chickory root, dandelion tea, inulin/FOS.
* Also
NO
honey dew melon, pawpaw/papaya, star fruit, quince, nashi fruit, guava, agave, sultana, currant, red ripe tomato, raisin, figs, chutnet, relish, plum, BBQ sauce, sweet & sour sauce, coconut