food science notes MT1

food science notes MT1 - What is food 1 2 3-can be seen as...

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What is food? 1. -can be seen as a mixture of different chemical compounds which are responsible for taste , smell , color , texture , nutritional value . 2. -source of nutrients: vital H y for growth and maintenance of the body supply energy, building materials to body 3. -various meanings: 1) Social linkages: celebrations, festivities, food sharing, etc 2) Social distinctions, status symbol (social class marker): -The color of bread consumed indicated the social status of a person (white bread was higher quality than whole bread) -food can be used as a sign of refinement sophistication c ,c 3) National identity (ethnic: Japan-sushi, Scotland-haggis) 4) Moral, religious significance What is food made of? 1. -water 2. -protein 3. -fats supply energy, calories 4. -carbohydrates 5. -vitamins 6. -minerals 7. And minor components (pigments, flavor compounds,etc) A. Chewing gum (p662) a) Gun base – manikara tree b) Sweetener – Xylitol (a sugar substitute) protect teeth less cariogenic c than sugar c) Flavoring B. E. Coli Bacteria Nestle cookie dough Escherichia coli, carried in feces (human/animal), can spread from contaminated food and water, from items touched by people who didn’t wash hands **If you make cookies from scratch, it is NOT safe to eat the raw dough C. Eating gelatin strength your nail? (p608) Gelatin is a protein comes from animals: pigskin, cattle skins and bones, fish gelatin. **There is no evidence that gelatin strengthens nails and hair. D. Why do onions make you cry? (p311) When cutting onions, a lacrimatory factor is produced, (lacrima tear c ); it is a volatile c substance; it irritate c the eyes; tears are produced to dilute and flush out the irritant. E. Green potato are poisonous h ? (p302) a) This one is no myth: contain bitter toxins, such as solanine, which accumulates when potatos are exposed to light. b) How to prevent? Store potatoes in a dry and dark cool place F. Honey (p667) **DO NOT feed honey to infants less than one year of age!! Honey bees collect nectar c , pick up pollen c , may also carry spores c of the bacterium (clostridium botulinum can cause botulism) G. Does the color of the eggshell affect the nutrition of egg? (p75) a) Eggshell color depends on kinds of chicken ( Shell breed) b) Yolk color is influenced by the diet of the chicken caroteniod pigments ( yolk feed) H. What makes popcorn pop? (p479) During heating, moisture c inside the kernel c is converted into steam creating pressure. Pressure build up until the kernel pops exposing it’s puffed up content.
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Hundreds years ago in US : --hunter-gatherers Lived on plants and animals gathered and hunt in the wild Nomadic lifestyle --~10000 years ago Agricultural Revolution” : Plant and animal domestication 1. First cereals domesticated were barley and wheat 2. Rearing goats, sheep, the pigs, cows 3. Man began to make bread and bear In china: rice; in Americas: corn among several other crops Food production, lifestyle changed First settlements gave rise to cities, to states and the first civilization. What do we eat today?
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food science notes MT1 - What is food 1 2 3-can be seen as...

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