Can I Get Fat Injections in my Breasts if I am Thin?

Obviously if there is no fat then the procedure is not possible. Most people do have some fat on their abdomens, inner thighs, flanks etc. also I have found that in thin patients a small volume of fat makes a big difference and is often enough to satisfy the needs.
I would have your plastic surgeon examine you and decide if this is an optional not.It does not make sense to me to have the patient put on weight before the surgery, unless they plan to maintain the increased weight. This is because the transferred fat survives as a graft and if you lose weight later you will lose volume in the grafted area as well.

Breast fat grafting is being increasingly used for reconstructive and revision breast surgery. If you are interested in the fat grafting, you have to have enough fat to harvest and transplant. Best, Dr. Karamanoukian

Sometimes if a patient doesn't have enough fat to transfer, they're encouraged to gain some before the treatment. However, I would have to see you in person to make a recommendation for you. You may have fat somewhere else on your body that you aren't able to see.