For the study led by Lübeck University in Germany, 16 participants were asked to spend three days eating a high-calorie brekkie followed by a less-filling second meal.
Then, they swapped things around and kickstarted the morning with a smaller breakfast before tucking into a more impressive lunch.
Anyone for brunch?
Results showed that a calorific breakfast helped to speed up metabolism - thus proving the theory that Dietary Induced Thermogenesis (DIT) is stronger in the early hours.
"Our results show a meal eaten for breakfast - regardless of the amount of calories it contains - creates twice as high diet-induced thermogenesis as the same meal consumed for dinner," author, Dr Juliane Richter, said on the study.