Your advice wouldn't work for anybody with a candida or parasite issue. I've had both, extremly severe to a point you wouldn't even imagine, I've helped many of my family members, friends and relatives get better from it, and NEVER an increase in caloric intake would get them better, rather the opposite. When you're sick, you're not digesting well in the best case, and you're not digesting at ALL in the worse scenario, so increasing your food intake is gonna lead you nowhere.
What makes you think you're knowledgeable about those issues? Your experience? You said it yourself, you don't have any.