For many years, I was puzzled by something I saw every day in practice.
I would give two patients the exact same meal plan and get completely different results. One would lose weight easily, feel satisfied, and stay motivated. The other would struggle with hunger, cravings, fatigue, and weight gain despite following the plan just as carefully.
I kept asking myself, "Why?"
The answer was often hidden in their genes.
For decades, nutrition advice has largely followed a one-size-fits-all approach. We have been told that everyone should eat the same way to achieve optimal health. Yet anyone who has tried dieting knows this is rarely true. What works wonderfully for one person may fail completely for another.
DNA testing for nutrition and metabolism has transformed the way I practice medicine because it helps explain these differences.
Our ancestors evolved in different regions of the world and adapted to different food sources over thousands of years. Some populations relied heavily on grains and starches, while others consumed more protein and fat. These adaptations influenced how our bodies process nutrients, regulate appetite, respond to exercise, and even metabolize caffeine.
Today, when I review a patient's genetic test, we analyze more than 70 genes involved in metabolism, appetite regulation, cravings, nutrient absorption, food sensitivities, and exercise response. These insights allow us to move beyond guesswork and create a nutrition strategy tailored to each individual's unique biology.
For example, some people are genetically better equipped to process carbohydrates and may thrive on a Mediterranean-style diet. Others may experience better energy levels, blood sugar control, and weight loss with a higher-protein approach. Some individuals are more prone to hunger and food cravings because of genetic variations that affect satiety signals.
This doesn't mean your genes determine your future. Far from it.
Your genes are simply information. They help explain why your body responds the way it does and provide valuable guidance for making smarter nutrition and lifestyle choices.
One of the most rewarding moments in my practice is when a patient finally understands why previous diets failed. Instead of blaming themselves, they realize their body may simply need a different approach.
The goal of personalized nutrition is not perfection. It is understanding your biology well enough to work with your body instead of against it.
Your genes are not your destiny, but they can provide the roadmap to better health.