Lecture 5 Notes - Transcription of Dr Wayne`s Lecture...

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1/31/07 Transcription of Dr. Wayne’s Lecture Nutrition and the Discovery of Essential Nutrients Study Hint: Use these notes and class power points to help you answer the questions posted on Blackboard that relate to today’s lecture. (Clicker Question) Answer E is the correct answer because the nucleus is the primary repository for heredity. The nucleus stores more genes than found in either the chloroplast or mitochondria [both of which also have their own DNA]. Last lecture covered : Cells are vibrant living structures Today’s lecture will cover : First of a series lectures examining nutrition [recall cells need energy to maintain their life functions] “I am what I eat” food & nutritional needs vitamins What did Randy represent using the overhead graph presented at the beginning, and through out lecture today? How science works (not a linear model) o Two steps forward & 1 steps back Critical thinking is needed, success in science means to avoid following “trends” (ppt) What does food do for us? Food replenishes the atoms in our body provides energy fuels ability to: o perform actions o think thoughts o prevent disease (ppt) What are the advantages/disadvantages of the following 4 different types of nutritional studies? 1. Case-Controlled Studies 2. Metabolic Studies 3. Cohort Studies 4. Randomized Controlled Trials Is one of the above methods better than the other? [Why OR why not] When would you choose to use each of these studies? In reality, you are left taking the limited data you have [acknowledging the limitations of that data] and make your best guess [example of critical thinking]. 1
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1/31/07 Transcription of Dr. Wayne’s Lecture (ppt) What are the main elements (composing over 96% of the total present) found in the human body? Keep the following in mind while progressing through the lectures on nutrition…… Answer, the life elements including: Oxygen (O) Carbon (C) Hydrogen (H) Nitrogen (N) Plus, trace elements (ppt) The life elements highlighted above are organized into the major organic compounds [proteins, lipids, carbohydrates, Nucleic Acids] making up the human body. (ppt) We should, therefore, eat foods that reflect the major chemical composition of our body. (ppt) It follows that, based on our chemical composition, we should eat foods reflecting our composition. However, we use up some nutrients faster than others chemicals that turn over faster have to be supplied at a greater rate than the nutrients that turn over slowly consequently, we have to be thoughtful about our diet (ppt) ALL heterotrophs have to kill to eat!!! Schweitzer argues we should, therefore, do this killing with a reverence for life. (ppt) Essential Nutrients Those nutrients that we can’t synthesize ourselves o vitamins o essential amino acids o essential fatty acids o minerals (inorganic salts) (ppt) What are Empty Calories… ingesting more calories than we burn off next to smoking , being overweight is the leading cause of the following disease s: heart disease stroke 2
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