Understanding fat retention after breast fat transfer

With breast fat transfer, no figure comes up more often than the retention rate: how much of the transferred fat stays. Published studies put it at about 50%. It can drop to about 30% if you lose weight and, conversely, rise to as much as 70% if you gain weight. Eating well, sleeping well and resting well all affect the result.

Breast fat transfer needs about 400–500 mL of pure fat after processing. The fat is harvested from the thighs, abdomen and love handles, and if there’s an area you’d like slimmed, I plan the surgery to take that into account.

Many people also worry about calcification and oil cysts. These are indeed the best-known complications of fat transfer. But the risk rises when too much fat is forced in; at an appropriate volume, a transfer doesn’t necessarily lead to them. Published studies put the rate at about 5%, and even that figure includes cases where only a small finding shows up on ultrasound.

That’s why I don’t aim to transfer as much fat as possible. I calculate the volume needed based on how much space the breast has, and transfer that amount. If the breasts sag significantly, it’s hard to lift them with fat transfer alone, so I suggest considering a breast lift as well.

Here is what the research shows. In a 2025 Danish study that followed 28 people (46 breasts) with MRI for 3 years after breast fat transfer, the volume settled at about 8 months (253 days), and on average 46% remained at that point. Body weight changed the retention rate considerably. When body mass index (BMI) dropped by 1, 22% remained; when it rose by 1, 57% remained; and when it rose by 2, 85% remained. A 2024 review of 35 studies (3,757 people) also found an average of 58%.

Many analyses have found that more fat stays with PRP and SVF than with standard fat transfer. However, when a 2021 analysis of 36 studies compared the two methods, there was no difference (71% and 70%), and in a randomized trial (10 people) that added cultured cells to fat transferred to the breast, there was no difference from fat transfer without them. As for calcification and oil cysts, a 2020 review of 2,073 people found oil cysts in 6.5%, calcification in 4.5% and fat necrosis in 1.2%; additional tests were done because of imaging findings in 16.4%, and a biopsy in 3.2%. Most of these are findings seen only on imaging, but taken one by one, they are not rare.