Benchmark 6E
The Human Organism: Physical Health
Grades K-2, page 144

Eating a variety of healthful foods and getting enough exercise and rest help people to stay healthy.

NSES Content Standard F 
Science in Personal and Social Perspectives: Personal health
Grades K-4, page 140
Nutrition is essential to health. Students should understand how the body uses food and how various foods contribute to health. Recommendations for good nutrition include eating a variety of foods, eating less sugar, and eating less fat.