How to keep arm fat to stay off after surgery?

Maintaining a stable weight and a healthy lifestyle that includes exercise is your best way to maintain your results after a surgical procedure.
You mention that you are still losing weight. It is recommended that your weight be stable for a period of time before surgery to promote the best healing and the best result. I recommend you review your weight loss timing with your surgical team so you can choose the best time to do surgery.
All the best to you,
Dr. Nancy de Kleer

The arm volume is the result of two things: fat and muscle, the envelop (skin) and ligaments among the fat makes the arms saggy or not.
Saggy arms are the result of aging and or losing and gaining weight and both cause flaccid tissues.
The only way you will maintain the thickness of the subcutaneous fat and the tension after tightening the skin (braquioplasty) is maintaining your weight and doing exercise. If you fail one, results will too. Your results won’t last forever because we continue aging.
Be encouraged!!
Dr. Cárdenas

Hello Mybestself 0118, thank you for your questions regarding how to keep arm fat to stay off after surgery. Thank you for your history. You mentioned that you are still losing weight and undergoing an arm lift (arm reduction or brachioplasty) later this year. However, your weight must be stable for three months before plastic surgery. Of course, undergoing plastic surgery while still gaining weight is not a good idea. Likewise, undergoing plastic surgery while losing weight is not a good idea. If your plastic surgeon gets your arms as tight as possible and you lose more weight after your arm lift surgery, you may need a costly arm lift revision to remove loose arm skin, which developed during your post-op weight loss. If you want maximum arm lift results, you should continue to lose weight. Once your weight plateaus for about three months, you should consider plastic surgery. Most plastic surgeons would agree that you should not undergo plastic surgery while losing weight.
Once your weight is stable and you undergo your arm lift, arm reduction, or brachioplasty, it is up to you to maintain your results. Maximum arm lift results can be achieved through dedicated aerobic and anaerobic exercise. To maintain your arm definition, plastic surgeons, registered dietitians, and physical fitness experts agree that you should target your main three arm muscles: biceps, triceps, and deltoids. These muscle groups should be targeted with weight lifting. Consider working with a personal trainer if you need help isolating your biceps, triceps, and deltoids. In addition to muscle training, you need to minimize your caloric intake. Plastic surgeons and registered dietitians suggest calorie counting and watching your macronutrients. Most plastic surgeons and registered dietitians suggest, for weight maintenance, a diet with minimal carbohydrates and low to zero sugar. Avoid all sodas and alcohol. Your diet should concentrate on complex proteins and vegetables. Also, consider what the sun does to exposed arms. Solar radiation damages the collagen and elastin fibers in the arms and leads to loose arm skin. Therefore, plastic surgeons recommend sunscreen and other forms of sun protection for your arms for your lifetime. These recommendations will help you to achieve maximal arm lift results. I hope my suggestions help to answer your question regarding how to keep your results after a brachioplasty or arm lift. These proven techniques will help to keep arm fat off after your arm lift. Remember, when seeking a plastic surgeon for an arm lift, arm reduction, or brachioplasty, always obtain several consultations and select the plastic surgeon with the most experience. Good luck.