The topic was veganism versus eating meat. Sugar wasn't a part of the conversation.
But obesity "in the standard American diet" was added to the conversation: "The standard American diet has brought us to, roughly, 30 percent of us being obese and/or diabetic from being fat ... and yet you decry a different way of eating."
Man has eaten meat for thousands of years and the 30 percent of Americans who are obese didn't get that way from eating meat.
Let's start with the parts of the food poison pyramid full of grains and other non-meat consumables.