More and more studies are focusing on the close link between diet and mental health. Far from simply providing energy to the body, what we eat also influences how the brain functions, our mood, and even our sense of well-being. In this context, physician Carmen Alegría has issued a message that has captured the interest of thousands of people for the simplicity with which she sums up this idea: “Treat your gut as if you owned a Ferrari—wouldn’t you use high-quality fuel?”
The specialist uses this comparison to explain that the digestive system needs high-quality foods to function properly. In the same way that a high-end car requires the best fuel to deliver maximum performance, the body responds better when it receives a diet rich in fresh and minimally processed products.
The gut, much more than a digestive organ
Alegría’s statement is not accidental. In recent years, science has deepened the study of the so-called gut-brain axis, a bidirectional communication system through which both organs continuously exchange information. In this process, the gut microbiota—the trillions of microorganisms that inhabit the intestine—plays a fundamental role, taking part in functions as important as digestion, the immune response, and the production of certain substances related to mood.
According to the expert, around 90 % of serotonin, popularly known as the happiness hormone, is produced in the gut. Although this serotonin does not reach the brain directly, it does reflect the importance of a balanced microbiota for the proper functioning of the body and for maintaining good communication between the digestive system and the nervous system.
How diet influences mood
For this reason, the quality of the diet can have a meaningful impact on emotional well-being. Research has observed that dietary patterns based on fruits, vegetables, legumes, nuts, whole grains, fish, and olive oil are associated with a lower incidence of anxiety and depressive symptoms. Conversely, a diet rich in ultraprocessed foods, added sugars, and low-quality fats promotes inflammatory processes that can also affect the balance of the microbiota.
The scientific evidence also supports this relationship. One of the most notable works is the SMILES study, published in 2017 in the journal BMC Medicine. In this clinical trial, people with moderate to severe depression who followed a Mediterranean-style diet rich in vegetables, fruits, legumes, whole grains, fish, and olive oil experienced a significantly greater improvement in their symptoms than those who only received social support. The researchers concluded that improving dietary quality can be a complementary strategy in the treatment of depression, always alongside the supervision of healthcare professionals.
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James Whitaker
I’m James Whitaker, a UK-based journalist focused on emerging trends and everyday stories gaining attention across the country. I cover the topics people start talking about before they fully break into the mainstream. My work aims to stay clear, factual, and closely connected to how news is actually consumed today.