Please inform your friend of the following:

I understand the passion, and appreciate it, but that wasn't a "debate". His guest ended up disengaging, and despite what some may thing, some audience members just want a compelling conversation, not just singular, self-appreciating perspectives, which is why panel led discussions can lead to pretty good numbers.

Second, a remedy is only useful if it can be realistically implemented. A cost benefit analysis should be performed to determine if the decrease in quality of life is worth the increase in health benefits. Remember that family and communal events are often based around food. Can his diet prescription be realistically implemented despite monetary, good scarcity, geographic, etc. restrictions?

Lastly, ice cream.