The cells would consume more energy, so you'd need more food, so in conditions of food scarcity (i.e. 99% of our [pre]history) you would be at a severe disadvan

The cells would consume more energy, so you'd need more food, so in conditions of food scarcity (i.e. 99% of our [pre]history) you would be at a severe disadvantage as your tribe would starve to death in conditions when more efficient homo sapiens would still survive.