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Lecture 5

URBS 359 Lecture 5: Lecture 5 Notes

3 Pages

Urban Studies
Course Code
URBS 359

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1.26.17 Lecture 5: The cultural politics of human biological variation and milk consumption in the US Today: • Review lactase and lactose activity • Introduce terminology to describe biology phenomenon of lactase activity in adulthood Carbohydrate review • Macronutrient • Most are found in plant products • Acceptable macronutrient distribution range (of all the calories you consume, what % should be carbs): 45-65% o Fat: 20-35% o Proteins: 10-35% • Atkins diet gets rid of carbs, because carbs are associated with gaining weight • Most people are getting their carbohydrates from refined carbs • It’s not good to limit our carbohydrate amount too much, and most of them should be coming from healthy carbohydrates • 3 kinds of carbohydrates: o Monosaccharaide o Disaccharides ▪ i.e. lactose o Polysaccharides Lactose • Disaccharide = glucose + galactose • Found in milk and milk products and commonly referred to as “milk sugar” • Cannot be absorbed directly, requires enzyme lactase • You need lactase to break down lactose in your diet • Lactase activity highest immediately after birth, which decreases with age in most mammalian species o Varies according to ethnicity: ▪ 80% SE asians ▪ 80% native americans ▪ 75% African americans ▪ 50% Hispanics ▪ 20% caucasians ▪ 10% north americans o Know that there is variability in terms of ethnicity. When you think about what groups tend to drink milk in the US and when thinking of nutrition programs, you need to think about this. Are there cultural or biological reasons why that particular group may not be consuming enough of a desired nutrient? • Variation derives from genetic regulation of lactase
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