FSN 101 Lecture Notes - Lecture 3: Vitamin B12 Deficiency, Basal Metabolic Rate, Hypercalcaemia

• School: University of Maine
• Department: Food Science and Nutrition
• Course: FSN 101
• Professor: Myracle

Document Summary

What is energy balance: making sure energy intake=energy expenditure. Positive energy balance: weight gain, more calories come in than out. Body-weight: the results from a dynamic equilibrium between energy intake (ei) & energy expenditure (ee) The factors that govern ee and ei are complex, poorly understood and there effects are difficult to predict. 1st law of thermodynamics: energy can be neither created nor destroyed. Kilocalorie (kcal): heat required to raise the temp of 1 kg of water 1 degree. Bomb calorimetry: used to measure the energy content of food. Food is dried and burn in a special chamber. Measures the temp increase in the water jacket of the machine. 60-70% of total energy needs (heartbeat, respiration, body temp) *highly varies between individuals. Body size, composition (lean), gender, age, hormones, body temp, tobacco use, caffeine. **how to calculate bmr: convert pounds to kilograms (2. 2lbs = 1kg) Gives an estimate but can vary up to 30%