The old line that breakfast is the most important meal of the day was always more advertising than science. A run of trials in adults with overweight or type 2 diabetes now shows that eating within an eight-to-ten-hour window can improve insulin sensitivity and help some people eat less without counting a single calorie.
The effect is not magic. Compressing the eating day often means fewer late-night snacks and a longer overnight fast. People who already eat reasonably well may see modest changes. People who use the window as permission to feast on ultra-processed food from noon to 8pm should not expect a metamorphosis.
Breakfast skippers have been scolded for years, especially parents. For children, a morning meal still matters for attention at school. For office adults, the evidence is more even-handed. A protein-rich breakfast can curb grazing. A 10am first meal can do the same if lunch is not a free-for-all.
Shift workers, pregnant women, people with a history of disordered eating and anyone on insulin should not treat social media fasting charts as clinical advice. Time-restricted eating is a structure. It is not a virtue.
“The clock is a useful tool for some patients,” said Dr Patel. “The plate is still the main event.”