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Why Do We Care About
I. Why do we care about fat?
A. Health concernsII. Statistics on obesity in American society
B. Attractivenss concerns
A. Through most of human history and even today for much of the world's population, starvation is a problem, not fat.IV. How do we get rid of extra stored fat?
B. Body fat as a positive adaptation1. energy storageC. Modern American diet makes fat constantly available and (let's face it) fat tastes good!!!
2. vitamin storage
3. insulation for thermoregulation1. dietary fat easily converted into stored fat
2. function of parts of the digestive system
3. role of fat in cellular respiration metabolism
A. Negative caloric balance, controlled by diet and exerciseV. Why do we care about fat? Its Role in Sexual Selection
B. This is much easier for some people than for others WHY?1. GenesC. A Complex Research Story - Obese mice and Leptin
3. Nervous system
5. Interactions among these systems1. Mutant obese mice deficient in leptin
2. Leptin as a hormone- Hypothalamus, leptin receptors, appetite supression, and feedback loops3. Leptin increases metabolic rate- Thermogenesis, brown adipose tissue, and uncoupler proteins
- Digestion, absorption, and metabolism of fats
A. Concern about fat as it affects attractiveness - a component of reproductive fitness
B. Mating Systems1. MonogamyC. Breeding Strategies
4. Some species-specific, some change according to environmental conditions1. Size and ageD. Mate Selection
3. "Sneakiness"1. Usually females are "choosier" about mates, if they make the greater parental investment (as they usually do).E. Some speculations about human behavior and sexual selection
2. What to look for:a. resources
b. Good genes hypothesis male quality, which may be judged by healthy and attractive appearance; i.e. size, vigor, lack of parasites, symmetry
c. Handicap hypothesis distinctive ornamentation which might make males more vulnerable to predation or risk-taking behaviors (thus the successful survivors that show such ornament or behaviors would be attractive to females, having demonstrated their ability to survive under adverse conditions)