Final answer:
Casein is a contraindication for several groups of people, including pregnant or breastfeeding women, premenopausal women needing extra calcium and iron, older adults, people with health issues affecting their ability to eat, and those avoiding certain food groups.
Step-by-step explanation:
Casein is a protein found in milk, including cow's milk. It is a contraindication for several groups of people:
- Women who are pregnant or breastfeeding: They may need to avoid casein if they or their babies have an allergy or intolerance to milk.
- Premenopausal women who may need extra calcium and iron: Casein can interfere with the absorption of these nutrients.
- Older adults: Some older adults may have trouble digesting casein due to reduced digestive enzyme production.
- People with health issues that affect their ability to eat: Certain health conditions may require a restriction of casein intake.
- Vegetarians, vegans, and others avoiding certain food groups: Casein is derived from animal milk, so those avoiding animal products may want to avoid it.