Here's the second part of the sequence! And so it begins...

(Edit: Added tail and slight coloring)

Part 1
Part 2
Part 3
Part 4
Part 5
Part 6
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Date: April 11th, 1490
Weight: 283 pounds

Description:
The participant’s body is still somewhat lithe, aside from the sizeable collection of fat in his midsection. The participant appears as though he is constantly engorged, even immediately after awakening. Upon physical examination, it began apparent that it was pure adipose. With even the most subtle of prods, the gray sphere would shake noticeably. Interestingly enough, the participant was not embarrassed by the examination, rather he appeared pleased with the disturbance of his adipose. The participant appears almost... proud of his expansion.

Report:
The participant has swiftly shattered my initial hypothesis (of the weight gain being gradual) - he has put on a startling 35 pounds in under a week. He has begun to eat more with each meal, having padded out breakfast, lunch, and dinner with a myriad of sweets. These developments are better than anything that had been predicted. The participant will continue to be monitored closely.