Doctor says I have to gain 10 lbs for BBL since I do not have enough of right type of fat needed for it. Suggestions? (photo)

The good news is, you appear in your photographs to have enough fat for a BBL. The bad news is, Urban Legends still abound in plastic surgery. By that I mean you had all the fat cells you are ever going to have in your body when you went through puberty. The theory that if you gain weight, you will have more fat cells to put into your butt to create a larger butt which will increase the amount of your Brazilian butt lift is patently ridiculous. People under 300 pounds are incapable of actually growing new fat cells. Actually, when you gain weight, you increase the size of the cell (hypertrophy), not the number of cells (hyperplasia). When a plastic surgeon harvests fat from any area, we are attempting to harvest healthy cells. Obviously cells that are overstuffed with fat are more fragile, more likely to burst in the harvesting process, and therefore not only the fat is lost, but the cell itself often gets destroyed. Ergo, the more you eat, the more likely you are to engorge cells which may not survive the fat grafting process.To create a larger and therefore lifted or more protruding buttocks, one transfers CELLS containing fat, not fat. Free fat or burst cells do not survive the transfer process, and their existence in an area of fat grafting only increases the inflammatory process which may, in fact, decrease the ultimate size of a BBL. Bottom line, eating more to gain weight to have fat cells available for a BBL makes no sense.

Hello dear!
Thanks for the question and provided information as well.
Based on your pictures, you are a great candidate for liposuction with BBL, and I think you'll get very good results. 
Liposuction allows your plastic surgeon to transform your entire shape. You can improve your abdomen, thighs, hips, back and flanks, and of course your buttock, to give you a nice heart shape.
In general, you need to be physically healthy and at a stable weight, have realistic expectations, be a non-smoker and your BMI needs to be 30 or less.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)

Hello. Thank you for the
pictures and detailed information. It
sounds like your surgeon is making the correct recommendations. I agree with my fellow surgeons in stating
that normally around 1/3 of the fat injected into the buttocks via a Brazilian
butt lift will shrink, so it is important that your surgeon have enough to work
with to make sure you get the results that best fit your body.