The phenomenon of late-night cravings for chips and pizza after a few drinks is not merely a result of lowered inhibitions or a lack of willpower. Instead, it's a complex hormonal response that can be understood through the lens of evolution and modern food production. In this article, I'll delve into the science behind these cravings, explore the role of the hormone FGF21, and discuss how our dietary environment influences our eating habits. Finally, I'll offer some insights on how we can outsmart our hormones and make healthier choices.
The Hormone Behind the Craving
What makes this particular study fascinating is the discovery of the hormone FGF21 and its role in regulating our appetite for protein. When we consume alcohol, our bodies trigger a pathway that spikes FGF21 levels. Historically, this hormone served a vital purpose: it nudged our ancestors towards savoury foods like meat or seafood, ensuring they obtained the protein necessary for muscle repair and overall body function. However, in today's world, where our food landscape has drastically changed, this biological mechanism can work against us.
Beware of the "Protein Decoys"
The researchers term these ultra-processed, low-protein savoury snacks as "protein decoys." When we drink, our elevated FGF21 levels demand protein, leading us to reach for these snacks. However, because these foods are actually low in protein and high in fats and carbohydrates, our bodies remain unsatisfied. As a result, we keep eating more and more, trying to satisfy a biological signal that a potato chip can never fully fulfil. This is where the real challenge lies: our hormones are tricking us into eating foods that provide little nutritional value.
The Sweet Tooth Exception
Interestingly, the hormone FGF21 has the opposite effect on our sweet tooth. The spike in FGF21 actually dampens our desire for sugar, which explains why we rarely see people pairing a glass of wine with a bowl of ice cream or a plate of iced cupcakes. This discovery highlights the complexity of our hormonal responses and how they can vary depending on the type of food we consume.
It's Not Just Liquid Calories
This breakthrough helps explain why alcohol affects people's weight so differently. For a long time, health advice focused strictly on the calories inside the glass itself. But this study proves that the surrounding dietary environment matters just as much, if not more. If you are drinking in an environment surrounded by minimally processed, wholesome foods, your total energy intake remains relatively stable. However, if you are surrounded by low-protein, ultra-processed savoury snacks, you are highly likely to overeat.
Outsmarting Our Hormones
So, how do we outsmart our own hormones? The research team suggests changing what we keep in the cupboard for a night in, or what we order alongside a drink. Instead of fighting a losing battle against our biology, we can lean into the protein craving with whole foods. Having options like roasted chickpeas, smoked salmon, lean cold meats, or even fresh prawns readily available will satisfy the FGF21 signal quickly, stopping the endless snacking cycle before it starts.
In conclusion, the science behind late-night cravings for chips and pizza is a fascinating interplay of evolution and modern food production. By understanding the role of the hormone FGF21 and the impact of our dietary environment, we can make more informed choices about what we eat and drink. Ultimately, it's about finding a balance between satisfying our biological needs and making healthy choices that support our overall well-being.
