A lot of my vegan friends love high carbohydrate diets. On the whole, they tend to respond really well to them. But all too often, they make the deductive leap that because it works for them, then it must work for everybody. Low-carbers and keto-philes are equally guilty of this n=1 conundrum.
Someone recently approached me at a fitness expo and asked me whether they should be doing an 80-10-10 diet (80% carbs, 10% protein, 10% fat). I asked her in reply, “Why do you think you should do an 80-10-10 diet?” She went on to explain that she had been advised to try it by a fitness competitor who is an advocate of vegan, high-carb diets and had been on it for a number of months. So I asked “How’s that working out for you?” “Not well,” she replied. We went on to talk about what had worked for her in the past, and she realised that despite 80-10-10 working well for her friend, it certainly wasn’t the best option for her.