I was doing 500mg of eth every week and my bloat came on big time in week two. Every one is different, some people wont bloat at those dosages, and some will. Get some anti e's just in case it starts to happen. No, you wont really be able to lose fat while your bloated. Bloating signals amoritization, aromitization signals high levels of estrogen in your system, high levels of estrogen= fat storage. Now if your diet is on point and you do some cardio, you may be able to gain muscle, and keep your bodyfat level the same, or even lower it a bit, but I wouldnt count on it, but then again everybody is different. Keep your anit e's on hand just in case you need them.