Nutritionist: Genes Determine How Coffee Affects the Body
Dubai – Qahwa World
Coffee has become an essential part of the morning routine for millions of people around the world, yet its effects on the body are not the same for everyone. According to nutritionist and specialist in natural health methods Janna Tikhanycheva, the way coffee influences the body depends largely on genetic factors, lifestyle, and consumption levels.
The expert explained that the body’s ability to absorb and process caffeine is linked to a gene known as CYP1A2. Some people carry versions of this gene that slow down caffeine metabolism, making them more sensitive to its effects. As a result, even a single cup can cause anxiety, insomnia, or an increased heart rate. For these individuals, Tikhanycheva recommends consuming coffee in moderation and remembering that caffeine is also present in tea, chocolate, and certain medications.
Coffee beans contain hundreds of compounds — some beneficial, such as antioxidants, and others that may negatively impact the body. Moderate coffee consumption has been associated with a lower risk of neurodegenerative diseases and depression, as well as improved insulin sensitivity, which can help reduce the likelihood of developing type 2 diabetes.
However, excessive intake can have the opposite effect. Caffeine blocks adenosine receptors in the brain, disrupting sleep quality, particularly when consumed in the afternoon or evening. It also stimulates the release of cortisol, the stress hormone, which over time can lead to fatigue and weakened adrenal function.
Tikhanycheva cautioned against drinking coffee on an empty stomach, as it can irritate the stomach lining and cause heartburn. She also noted that certain compounds in coffee reduce the absorption of iron, calcium, and magnesium.
“It’s important to remember that caffeine is not found only in coffee but also in black and green tea, cocoa, chocolate, and some medicines,” she emphasized, adding that monitoring total daily caffeine intake is essential.
Doctors have previously warned that coffee may be harmful to children and adolescents, as it can trigger anxiety attacks, suppress appetite, and cause stomach discomfort such as pain or acid reflux. Regular consumption may also increase the frequency of urination.
