How are food composition and the physiological effects of food on the body being studied in nutrition?

• A. By analyzing nutrient content in foods and conducting controlled human studies to measure selected biomarkers and health outcomes.
• B. By performing population-level studies using dietary surveys and statistical methods to examine associations between intake and health indicators.
• C. By combining nutrient analysis, in vitro and animal models, human trials, and integrative omics approaches to link food components with physiological effects.
• D. By compiling nutrient databases, applying dietary reference values, and estimating physiological effects based on nutrient intake patterns.