I'm guessing foods that contain natural fats such as avocado are fine, right?It's already scientifically proved that spot fat reduction is impossible. If you have high but fat, that means you have a greater amount of overall fat percentage in your body. So, I would recommend you to drop the fat percentage by a healthy lifestyle. You need to drop overall fat consumption. It may take a lot of time but if you are consistent, your fat will get reduced drastically. That is the tactic that I followed and I must say, I was successful .
To loose the but fat, you have to drop your overall body fat. I agree with healthlover. You have to build a healthy lifestyle. It would not shed off in one or two months. You should eat healthy, exercise. Exercise can help you to drop the butt fat because it burns a lot of calories. I would recommend you a minimum of 45 minutes exercise on a daily basis.
I believe this problem is the same as that faced by women who lose their breast size when they lose weight. Apparently, the body loses fat equally from all parts of the body. However, the butt has an advantage over the breast. The breast is basically fat and it has no muscles. The butt, on the other hand, has both fat and muscle. The muscles can be developed individually. So you can do exercises which specifically target the muscles in your butt. Then you can build up a good looking butt while reducing fat generally all over the rest of your body.
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Well, since the exercise is what's making you lose so much weight in your butt, and you're really tiny, I'd say that as long as you continue to do that exercising, you are probably going to have to regularly add some type of healthy fat to your diet. You're obviously burning up what little bit of 'meat' you have on your body, so you're going to have to go into 'replenish mode'.
I hear that nowadays, there are hormones (or are they steroids?) which are injected into the butt area to stimulate fat accumulation in that area. But I wouldn't recommend this short cut due to the fact that it might have unknown side effects. The best way is to do squats and situps as well as other exercises centred around the groin area. This should be accompanied by an increased protein intake to stimulate the gluteus muscles.
I consider your question to be a perfect one, I mean, it's one feature that you would like to be complimented by. I'm going to share what has worked for me. When I first started I was doing a lot of cardio training and it got me to slim down but lost my butt in the process. Work on your strength with weights and eat the right amount of protein. I'd say 20 gm of protein per meal will do it. Do your squads and continue your regular activities but without going overboard with the cardio so that you can still enjoy a nice shape as a result of weight training and a good diet.
Try push ups or wall press exercise.