UMass Amherst NUTRITN 130 - Some Causes of Obesity (3 pages)

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Some Causes of Obesity

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Some Causes of Obesity


We discussed some causes of obesity and how it affects our body.

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University of Massachusetts Amherst
Nutritn 130 - Nutrition for a Healthy Lifestyle
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Nutrition 130 1st Edition Lecture 30 Learning Objectives Know what is considered a healthy BMI range and understand its relevance to health Be able to identify the specific health outcomes associated with visceral fat and sitting waist measurement Be able to identify the benefits of sustained moderate weight loss Be able to identify the factors that contribute to BMR and how to modify them Understand the factors that contributes to weight gain and obesity Be able to calculate weight loss for specific calorie deficits Be able to identify the components of mindless and mindful intuitive eating Leptin Can have genetic defect in leptin receptors o Causes obesity Leptin produced does not function properly causing Leptin resistance o Caused by obesity Causes of Obesity Hormone disruption o Produced in intestinal tract o Decreases appetite o Lower levels Obesity Eating fast o Ex PYY o Obesity individuals have lower levels of PYY when they are fasting These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Show less of an increase in PYY after meals than non obese Review questions Give some examples of the genetic differences between people which could increase their risk of becoming obese What two situations as discussed in class can disrupt the effectiveness of leptin How are PYY levels difference in overweight people Which of the following are genetic differences between people which could account for a greater risk of obesity Which of the following neuroendocrine differences between normal weight and overweight people have been identified Differences in leptin s effectiveness Differences in levels of PU when fasting and other meals Childhood obesity Rat experiment o They induced hyerphagia overeating with hormones and early onset childhood obesity then reversed it at various times in the young rat s life o Timing and duration of overconsumption may have lasting effects on a person s natural weight sometimes called set point Causes of Obesity Stress and Disrupting the Body Clock o Less sleep o Eating irregularly o Shift work o Chronic stress Causes high cortisol levels and disrupts appetite regulation Then causes Obesity Heart disease Lack of Exercise o The number of trips people take on foot has dropped 42 in the last 20 years o Exercise recommendations Recommended time 4 hours per week Actual time spent total 2 hours Too much sitting o 55 of non exercising time is spent sitting o Risk for obesity and CHD that is separate from too little exercise o Benefits of daily exercise can be undone o Time spent sitting is significantly associated with Increase risk for obesity and CHS that is separate from too little exercise Increase fat deposited around the heart Food Addiction o Highly palatable food activates brain reward system o Chronic food restriction and weight loss enhances the sensitivity of these reward systems may lead to binge eating o Overeating can reduce the brain s response to palatable food increasing the amount of food needed for the same rewards as in cocaine Binge eating in Rats Research shows that an animal will binge eat on highly palatable food when it is restricted

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