Sorry, I misread you. I understood "how you conclude anything for humans".
Well, the first thing is that in biology most of the time we only have correlations and causality is less clear than say for instance in physics. An important thing is that the biggest studies on longevity and the consensus of doctors and biologists are that a hypocaloric diet has longevity benefits. Most of consistent with animal models, but is the current approximation to the subject that most of us agree on.

If you have any recommendation to improve my writing I would appreciate it dearly. Especially since today I had so many troubles with a glitch in a macro I made for the HTML and had to correct so many times. Thanks, again.