How much you lose from your chest (or how small your boobs get) depends on how much fat you store thereand how much weight you have to lose overall. When you lose weight quickly, the elastin and collagen that support your breast tissue experience stress, causing them to break down rapidly. Put these proteins under the constant stress of losing and regaining pounds, and they deteriorate prematurely, leaving your breasts permanently flaccid. unfortunately, most womens breasts do shrink when they lose weight. Not all though, a friend of mine lost 10 kilos (about 22 pounds) and her breasts did not shrink at all. You need to lose weight for health reasons, and it is far easier to lose weight when you are young than when you are an. The skin stays the same size but when you lose weight you lose it throughout your entire body. Your boobs are made up primarily of fat, so expect them to shrink and get a little sag to them. Dont worry though, no matter what society tries to tell you there are plenty of guys (like me) that love natural breasts that have a little sag to them. If you want to be able to run, lose weight and keep your boobs try an all-natural breast supplement. Start our 1, 3, 6, or 12 month supply today using coupon code breastshrinking for 10 off or click here to have your coupon instantly applied. The fat in your stomach, buttocks, and breasts, are all reduced as your weight drops. The end result, your breasts shrink in size and the surrounding skin is now loose and sagging. Although sagging skin in the breasts is a natural occurrence after weight loss, it can give the appearance of the breasts looking deflated. if you lose it too fast ur boobs will shrink, cause thats what happened to me and then if you gain some weight back and they get a lil bigger. So dont over do it on the cardio and try doing more weights and you should be fine.