Norman Walker was a man who lived a long time ago and he was very interested in how what we eat affects our health. He studied a lot and found out that the things we eat can help us be healthy or make us sick. He said that the best things to eat are fruits and vegetables, especially ones with lots of green, and that we should drink plenty of water too! He also said that it's important to eat food that is alive (like fresh fruits and veggies) instead of food that is dead (like processed foods) because alive food gives us more energy and helps our bodies work better. Basically, Norman Walker was a smart man who wanted to help people be healthy by telling them to eat lots of fresh fruits and vegetables and stay away from processed foods.