Nutrition Fueling Body is the practical application of nutrition science to optimize how your body performs. It goes beyond "eat healthy" to understand: how macronutrients (protein, carbs, fat) fuel specific activities, how micronutrients support recovery, meal timing's impact on energy and performance, and individual variation in nutritional needs. The skill includes reading food labels, calculating macros, designing meal plans, tracking nutrition, and adjusting based on biomarkers (weight, energy, athletic performance). It's both science (biochemistry) and art (preference, sustainability).