Thanks Kim!

I've been talking to a CRON (Calorie restriction with optimal nutrition) person. It's a long story but just about every creature who is restricted on calories has a 30% or more longer life-span. There have been no exceptions found yet. So there are people actually doing this now and participating in experiments. Their blood test results, BP, and other signs indicate it is working well for them. It helps with all kinds of allergy and autoimmune conditions. But there are drawbacks. People tend to get grumpy, their reproductivity decreases, they get skinny, they're cold all the time. IF should avoid this.

But there are special caveats for starting this later in life. You have to ramp up slowly. Now IF seems to have the same effects as CR but I don't think the mid-life use of IF has been studied. So I am thinking of getting off this for awhile and starting up more slowly. Slowly lengthening the fasting time.

The biggest difference is that IF is easier to follow than CR. You don't have to reduce your total calorie intake, you don't have the crankiness and coldness and hopefully it won't reduce fertility.