two very different machine for different use cases

Dr. Walford UCLA is the poster boy for calorie restriction. Check out his site at walford.com. Calorie restriction is the only technique found to actually extend life in every species that has ever been tested. Many snake oil salesmen want to get you to pay for the latest supplement or herb, but none of these have any significant research backing up their claims. Dr. Walford's comment to any of these hucksters is show me the mouse studies. I believe that Chimp studies are in progress and preliminary results show that the technique is working -- for full results we will have to wait 20 or 30 more years. That is why there are a large number of humans already practicing calorie restriction including Dr. Walford and presumably has grad students. The big news for those over 25 is that we now have some evidence that the technique works if started later in life.