From the looks of it, the show is still pro-fat. The treatment the protagonist gets as a hambeast is portrayed as a negative instead of a positive, and it loses weight because it got injured and had its jaw wired shut, not through self-reflection and habit change (correct me if I got the plot wrong though). In the real world it would blow right back up to fatassery the moment it got its jaw unwired. The hambeasts only dislike it because it doesn't skirt the truths that fat is ugly and caused by poor personal choices.