For women, skipping breakfast or delaying the first meal disrupts key hormones (cortisol, ghrelin, leptin), which causes afternoon fatigue, sugar cravings at the end of the day, and impairs sleep quality. Eating breakfast within an hour of waking up helps stabilize these hormones and naturally regulate appetite.

noli's read

Scientific research largely validates the importance of breakfast for female hormonal balance. An observational study conducted by Witbracht et al. (2015) shows that skipping this meal disrupts the natural cortisol rhythm in women, keeping this stress hormone at an abnormally high level during the day. Furthermore, a recent randomized clinical trial (2026) published in The Journal of Nutrition confirms that the absence of breakfast increases ghrelin (the hunger hormone) and encourages the intake of high-carb and high-fat foods in the evening. Chrononutrition also shows that morning intake helps regulate the morning cortisol spike, an effect particularly marked in women according to USDA clinical work. However, the claim that one must imperatively eat 'within the hour' following waking is primarily an expert opinion and lacks strict clinical evidence compared to a more flexible two-hour window. Finally, attributing 4 p.m. energy slumps or sleep disturbances solely to breakfast timing oversimplifies highly multifactorial biological regulations.

the sources

1. 1Sievert K et al. 2019
2. 2Cioffi I, Evangelista A, Ponzo V, et al. 2018
3. 3Lowe DA, Wu N, Rohdin-Bibby L, et al. 2020
4. 4Liu D, Huang Y, Huang C, et al. 2022
5. 5Jamshed H, Steger FL, Bryan DR, et al. 2022