> By the way he goes on talking about diet soft drinks, and explain that they are also bad, you produce insulin anyway.

This is where I'd start to tune out on other stuff this person is saying. I looked into this a while back when my son sent me those studies/links (we've been in a constant bar-argument debate over if real Coca-Cola is better or worse for you than Diet Coke) and I recall that it was highly specific to individuals. Some displayed a slight insulin response, while others did not.

I hit my weight loss extremely aggressively in the past year, and as part of that wore a CGM. I drink far too more diet coke than I reasonably should, and I've never been able to correlate any blood sugar events (high or low) to my diet coke or coke zero consumption. You'd think there would at least be a small amount of data in the graphs to tease out given it's a daily thing for me.

Of course abstaining from both is the right answer - but there has been no clear repeatable data I've seen yet that shows detrimental health from the artificial sweeteners commonly used. A lot of the first studies that got traction were either extremely flawed, non-repeatable, or using dosing that never made sense to test with.