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Adipose Tissue IV Fatty Wap Squad (FWS) JONATHAN GRIMWOOD EDDIE SMITH LEAH SANDERS LEAH WAGNER Primary Functions Acts as an insulating layer, helping to reduce heat loss through the skin Provides mechanical protection and support around organs (e.g. kidneys) Means of energy storage and reserving nutrients Food that if in excess to requirements is converted into fat and stored within adipose tissue Peak Functional Levels Brown Adipose Tissue (BAT) Uniquely able to rapidly produce large amounts of heat through activation of uncoupling protein (UCP). Maximally stimulated brown fat can produce 300 watts/kg of heat vs 1 watt/kg in all other tissues Uncoupling Proteins UCPs are mitochondrial transporters present in the inner membrane of mitochondria Found Only in all mammals and in plants detected in brown adipocytes Belong to the family of anion mitochondrial carriers including adenine nucleotide transporters Originally used for UCP1, which is uniquely present in mitochondria of brown adipocytes UCP1 Function is to create a fatty acid-activated uncoupling of respiration Acts as a proton carrier activated by free fatty acids Creates a bypass between complexes of the respiratory chain and ATP synthase Activation enhances respiration and results in a pointless cycle and dissipation of oxidation energy as heat Only present in small amounts in the fetus and in mammals (e.g.: sheep and humans) BAT Retained until adulthood Retains the capacity to have a significant role in energy balance Currently a primary target organ in obesity prevention strategies Understanding the primary factors that regulate both the appearance and the disappearance of UCP1 in early life may enable strategies to prevent excess white adipose tissue deposition through the life cycle Table 1: Summary of the main developmental changes in adipose tissue during early life. Stage of development Proliferative phase Preparatory phase Thermogenic phase Lipogenic phase Primary adipose tissue characteristics Preadipocyte Brown adipose tissue Brown adipose tissue White adipose tissue Function Cellular multiplication necessary to form adipose tissue depot Acquisition of large amounts of uncoupling protein 1 (UCP1) Rapid activation of UCP1 in order to prevent hypothermia Lipid deposition and storage Most abundant gene Antigen identified by monoclonal antibody ki-67 Long form of UCP1 prolactin receptor Leptin http://www.hindawi.com/journa ls/scientifica/2013/305763/ Peak Body Fat According to National Institutes of Health (NIH) a healthy body fat % can lower your risk of developing HTN, high cholesterol, Dm, and heart disease Positive benefits Increasing energy levels Improving flexibility and function Recommended Percent Body Fat (based on American College of Sports Medicine guidelines): Age 20-29 30-39 40-49 50-59 60+ Female 16-24% 17-25% 19-28% 22-31% 22-33% Male 7-17% 12-21% 14-23% 16-24% 17-25% http://healthandwellness.vanderbilt.ed u/news/2011/09/body-fat-percentage/ Table 13.2B Body fat percentage for the athletic population Sport Baseball Basketball Body building Male 12-15% 6-12% 5-8% Female 12-18% 20-27% 10-15% Sport Rowing Shot Putters Skiing (X country) Male 6-14% 16-20% 7-12% Female 12-18% 20-28% 16-22% Cycling Football (Backs) 5-15% 9-12% 15-20% No data Sprinters Soccer 8-10% 10-18% 12-20% 13-18% Football (Linemen) 15-19% No data Swimming 9-12% 14-24% Gymnastics 5-12% High/long Jumpers 7-12% 10-16% 10-18% Tennis Triathlon 12-16% 5-12% 16-24% 10-15% Ice/field Hockey 8-15% 12-18% Volleyball 11-14% 16-25% Marathon running 5-11% 10-15% Weightlifters 9-16% No data Racquetball 8-13% 15-22% Wrestlers 5-16% No data http://www.humankinetics.com/excerpts/excer pts/normal-ranges-of-body-weight-and-body-fat Peak Nutrient Level There are 9 calories in every gram of fat, regardless of what type of fat it is. Fats are more energy-dense than carbohydrates and proteins, which provide 4 calories per gram. Eating foods with fat is definitely part of a healthy diet. Remember to choose foods that provide good fats (monounsaturated and polyunsaturated fats) and balance the amount of calories you eat from all foods with the amount of calories you burn. Aim to eat a dietary pattern that emphasizes intake of vegetables, fruits, and whole grains; includes low-fat dairy products, poultry, fish, legumes, non-tropical vegetable oils and nuts; and limits intake of sodium, sweets, sugar sweetened beverages and red meats. Doing so means that your diet will be low in both saturated fats and trans fats. Dysfunctional Levels The NIH has stated that a high percentage of body fat can put one at risk for HTN, high cholesterol, Dm, and heart disease. There is also emerging evidence of a strong association between obesity and an increased risk of cancer. Obesity is defined as an abnormal or excessive fat accumulation that involves a risk to health. The health consequences of obesity are huge and varied, ranging from an increased risk of premature death to several non-fatal but debilitating diseases that have adverse effects on the quality of life. Dysfunctional Levels Cont. Obesity typically leads to insulin and leptin resistance and a shift to dysfunctional adipose tissue. These conditions cause metabolic dysregulation with elevated circulating fatty acids and an increased secretion of proinflammatory adipokines. When left untreated, these conditions cause lipotoxicity, chronic inflammation, hypertension, atherosclerosis and cardiovascular disease. A positive association between obesity and the risk of developing type 2 Dm has been also repeatedly reported in different studies. Intra-abdominal fat accumulation, has been associated with an increased risk of prediabetic conditions such as impaired glucose tolerance and insulin resistance Fig. 2 summarizes the potential pathways directly linking dysfunctional adipose tissue to obesity and cancer. http://www.sciencedirect.com/science /article/pii/S0005272810007620 Dysfunctional Nutrition Levels Obese individuals are frequently characterized by an impaired lipid profile, in which plasma triglycerides are raised, HDL-cholesterol concentrations are reduced and low-density lipoprotein apo B (LDL-apoB) levels are raised. Consuming high levels of calories – regardless of the source – can lead to weight gain or being overweight. Consuming high levels of saturated or trans fats can also lead to heart disease and stroke. Standards of Fatness Men Women Underfatness <3 <12 Essential Fat 3 12 Optimal Health 3-20 12-30 Overfatness 20-25 30-35 Obesity >25 >35 WHO 1998 Overfat According to University of New Mexico, excess fat produces hormone-like inflammatory proteins called cytokines; these may play a role in the development of diabetes, obesity and heart problems. High body fat, particularly around the waist, is associated with metabolic syndrome, a condition with a constellation of symptoms that include insulin resistance, glucose intolerance, high blood pressure, abnormal cholesterol levels and high blood triglycerides. According to MayoClinic.com, metabolic syndrome increases your risk of serious health problems such as diabetes, heart disease and stroke. Underfat Conversely, many problems can arise from not having enough body fat. The body needs a certain amount of body fat to perform basic physiological functions. Phospholipids are needed for cell membrane formation, and the triglycerides found in adipose tissue provide insulation and store metabolic fuel. In addition, lipids are involved in the storage and transport of fat-soluble vitamins and in the functioning of the nervous and reproductive systems, the menstrual cycle, and growth and maturation during pubescence. Resources (n.d.). Retrieved November 2, 2015, from http://www.sciencedaily.com/terms/adipose_tissue.htm Body Fat Percentage. (n.d.). Retrieved November 2, 2015, from http://healthandwellness.vanderbilt.edu/news/2011/09/body-fat-percentage/ Brown Adipose Tissue Growth and Development. (n.d.). Retrieved November 2, 2015, from http://www.hindawi.com/journals/scientifica/2013/305763/ Diabetes. (n.d.). Retrieved November 2, 2015, from http://diabetes.diabetesjournals.org/content/53/suppl_1/S130.full High Body Fat & Negative Effects on Hormonal Structure. (2015, January 28). Retrieved November 2, 2015, from http://www.livestrong.com/article/552291-high-body-fat-negative-effects-on-hormonalstructure/ How Much Body Fat is Healthy? / Nutrition / Fats. (n.d.). Retrieved November 2, 2015, from http://www.fitday.com/fitness-articles/nutrition/fats/how-much-body-fat-is-healthy.html Normal ranges of body weight and body fat. (n.d.). Retrieved November 2, 2015, from http://www.humankinetics.com/excerpts/excerpts/normal-ranges-of-body-weight-and-body-fat Role of obesity-associated dysfunctional adipose tissue in cancer: A molecular nutrition approach ☆. (n.d.). Retrieved November 2, 2015, from http://www.sciencedirect.com/science/article/pii/S0005272810007620 Structure and Functions of Adipose Tissue. (n.d.). Retrieved November 2, 2015, from http://www.ivyroses.com/HumanBody/Tissue/Tissue_Adipose-Tissue.php QUESTIONS