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Most on this forum have found that fat does not affect weight loss, but carbs do.
I'm pretty sure that's what he meant. "affect" as in "negatively affect".About macro ratios, it varies. The more carnivores are pretty close to zero carb (or are at least consistently under 50g a day). People who eat more fruit or veggies are usually ~ 100 - 150g of carbs a day. The macro ratio varies depending on total calories.