Was it a simple cold, or did you catch obesity too? It's a disturbing thought. Is it that we just seem to gain weight as we age, or that we just catch the wrong virus and suddenly obesity comes more naturally? And if they do develop a vaccine for these viruses, then will there be a lost generation, victim of the ills of obesity when the younger generation just doesn't understand what the big deal is? Sounds like a foundation for a science fiction story.