protein would have to be converted to glucose and then that glucose to triglyceride (this can happen to some degree in boht liver and fat cell), this would also impact on overall fuel utilization (you'd burn more protein and carbs and less fat making any dietary fat more likely to be stored)
glucose can be converted to triglyceride. more importantly, whne you increase carb intake, fat oxidation goes down; the fat you're eating is stored more readily. this second mechanism is going to be the rimary way that 'overeating carbs makes you fat'.
fat is stored directly
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