Perhaps it is similar to the white foam you get when boiling up a meat broth, which i believe is just protein or protein/fat...
Goal 1 - break 200 (46 pounds lost)**DONE**
Goal 2 - leave obesity behind (BMI 29.9, at 185#) **DONE**
Goal 3 - BMI = Normal (154# or less)
| current weight: 172.5