A while back you made a statement that said that when one uses an ultra-low carb diet for long periods of time, the body starts storing fat instead of burning it since fat becomes the only fuel source available. How is this possible on a hypocaloric diet? I've read that below 50g carbs per day can impair thyroid function in some people, although I doubt this is the case if adaquete protein is eaten since some will be converted to glucose through gluconeogenesis. I asked Lyle about the above comment and he doesn't believe this is possible, even on a zero carb keto-diet, if calories are reduced fat will be lost and not stored. Just looking for clarification and/or research to support that this is possible. I've been feeling great eating near zero carbs most days, workouts are fine, but if this is potentially slowing fat loss i'd like to know.