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We Were Wrong About Fasting, Massive Review Shows Or that intermittent fasting would make you irritable, distracted, and less productive? Snack food ads warn us that "you're not you when you're hungry", reinforcing a common belief that eating is essential to keep our brains sharp. We're told constant fuelling is the secret to staying alert and efficient. Yet time-restricted eating and intermittent fasting have become hugely popular wellness practices over the past decade. Millions do it for long-term benefits, from weight management to improved metabolic health. This raises a pressing question: can we reap the health rewards of fasting without sacrificing our mental edge?