People who consider themselves early risers are more likely to have a healthy diet.
And, conversely, individuals whose energy spikes later in the day are more predisposed to eating higher levels of sugars and fats.
That's because, according to researchers, the timing of our body clocks plays a substantial role in how eating habits are determined throughout the day.
The study, published in academic journal Obesity, analysed the diets of 1854 Finnish men and women aged 25 to 74.
During weekdays, night owls ate less for breakfast but still managed to eat more sugar, carbohydrates and saturated fat than their early-morning peers.