Biology
Core Concepts in Nutrition
Quick fact
The human body can produce vitamin D from sunlight, but it cannot produce vitamin C—making it an essential nutrient that must come from food.
Why this is interesting
You eat every day, yet most people can't explain exactly what their body does with that food—and why some foods are called 'essential' while others are optional. What if understanding just a few core concepts could transform how you think about every meal?