Blood sugar spikes differently in different people even when they eat the same food, and this film follows the scientists trying to turn that fact into a diet plan. At the University Hospital of Schleswig-Holstein, Professor Christian Sina argues that sorting foods into 'healthy' and 'unhealthy' makes no sense; what matters is sorting people into categories based on what their own bodies tolerate. In Rehovot, Professor Eran Elinav of the Weizmann Institute of Science explains the algorithm his team built from stool sample analysis, now driving a nutrition app used by more than 70,000 people. German companies already sell DNA-based diet plans to consumers, and the film brings in nutritionists and consumer advocates who question whether the science behind them is solid enough to justify the price. Interviews with researchers, everyday users trying the tests, and skeptics are cut together with lab footage of sample processing and app demonstrations, giving equal weight to the promise of precision nutrition and the doubts about whether it delivers.