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Weight Management/ Nutrition - PowerPoint PPT Presentation

Weight Management/ Nutrition. “A man’s health can be judged by which he takes two at a time – pills or stairs” - Joan Welsh. Counting Calories…. What is a calorie? How is caloric content of food determined? How do we determine recommended daily caloric intake? Resting metabolic rate

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he takes two at a time – pills or stairs”

- Joan Welsh

• What is a calorie?

• How is caloric content of food determined?

• How do we determine recommended daily caloric intake?

• Resting metabolic rate

• Estimated caloric expenditure from activity

• A calorie is a unit of measurement for energy.

• Derives from the Latin calor (heat). In most fields, it has been replaced by the joule, the SI unit of energy.

• The small calorie or gram calorie (c) approximates the energy needed to increase the temperature of 1 g of water by 1 °C. This is about 4.185 J.

• The large calorie (C) or kilogram calorie approximates the energy needed to increase the temperature of 1 kg of water by 1 °C. This is about 4.185 kJ, and exactly 1000 small calories.

• In scientific contexts, the name "calorie" refers strictly to the gram calorie, and this unit has the symbol cal. SI prefixes are used with this name and symbol, so that the kilogram calorie is known as the "kilocalorie" and has the symbol kcal.

• Colloquially, and in nutrition and food labeling, the term "calorie" almost always refers to the kilogram calorie.

• Bomb calorimetry

• CI= Basal metabolic rate + Calories used for activity

Recommended Caloric Intake (for weight increase)

• CI > Basal metabolic rate + Calories used for activity

• CI < Basal metabolic rate + Calories used for activity

• “Gold standard”: Indirect calorimetry during resting and fasting [12h post absorptive] conditions

• The more muscle mass…the more oxygen the body consumes… the higher metabolism (BMR)

• Males have higher amount of muscle mass therefore higher metabolism

• Muscle requires more energy to be sustained than fat for example.

• 3.5 ml/kg/min is a normal resting oxygen consumption value, which is converted into energy equivalents.

• Height + weight (body surface area) and gender used in original equations for estimating BMR

• The original Harris-Benedict equations

• for men, 66.4730 + (13.7516 * w) + (5.0033 * s) − (6.7550 * a)

• for women, 655.0955 + (9.5634 * w) + (1.8496 * s) − (4.6756 * a) >

• where w = weight in kilograms, s = stature in centimeters, and a = age in years.

• Resting Metabolic Rate Calculator:

• Women: BMR = (4.35 x weight in pounds) + (4.7 x height in inches) - (4.7 x age in years) [MAY BE INACCURATE]

• Men: BMR = 66 + (6.23 x weight in pounds) + (12.7 x height in inches) - (6.8 x age in years)

• (imperial units)

• Sedentary: (little or no exercise): BMR x 1.2

• Light activity: (moderate exercise or sports 1 to 3 days per week): BMR x 1.375

• Moderate activity: (moderate exercise or sports 3 to 5 days per week): BMR x 1.55

• Very active: (hard exercise or sports 6 to 7 days per week): BMR x 1.725

• Extremely active: (very hard exercise or sports and a physical job, activity or training 2 times per day): BMR x 1.9

Mats Daily Activity Log

• Cycling at a slow pace: 20 minutes (120 kcals)

• Watching TV: 2 hours

• Working in front of computer: 8 hours

• Pondering how horrible life is and why I am not getting paid more: 2 hours

• Playing the guitar: 1 hour

• Talking on the phone: 1 hour

• Sleeping: 9 hours 40 minutes

• Estimated Energy Requirement (EER): 2678 Calories (including basal metabolic rate for a 31-year-old 190 lbs male)

• In other words: very SEDENTARY

• Meat and beans (26.2 cup equivalent)

• Meat sauce

• Ham

• Fruits (2.8 cup equivalent)

• Bananas

• Vegetables (2.3 cup equivalent)

• Tomato sauce

• Grain (31.3 cup equivalent)

• Spaghetti

• Milk (15.4 cup equivalent)

• Yoghurt

Macronutrients

• Use MyPyramidTracker.gov (USDA)

• and compare and contrast with formulas presented in today’s class.

• Energy intake-Energy expenditure: 6769-2678 = +4091 kcal

• Milk 513%

• Meat and Beans 403%

• Vegetables 80%

• Fruits 115%

• Grains 348%

• “Your reported food energy intake is very much higher than your Estimated Energy Requirement for the day. An increase of 500 or more Calories per day over time could result in regular and perhaps quick weight gain.**If you consume 500 Calories more a day than you need, you could gain about 1 pound per week”

Why isn’t Mats abnormally fat already?

• TRUE: Acetyl CoA [used in the committed step of fatty acid synthesis] and NADPH [serves as electron donor; from the pentose phosphate pathway]

• TRUE: Some researchers claim ~ 2% of excess glucose is turned into glycerol (backbone of triglycerides)

• Then the question arises whether or not three free fatty acids are added to each glycerol).

• Triglycerides are stored in adipocytes (fat cells)

• All excess glucose/protein may not be converted into fat after all…

• Where does excess glucose go?

• Urine

• Yes, I pee a lot.

• Increased body temperature

• I’m hot too ;-).

• Based on your RMR + physical activity calculations: How much whole milk can you consume per day to fulfill your daily caloric need?

• Based on daily recommended intake: Are you over-consuming any of the micro/macronutrients mentioned on the food label (if you fulfill your entire caloric intake with this particular food item)?

• Do the same tasks as above, but this time with skim milk.

• What about 0-calorie sodas? How many can you consume per day? Any side effects?

Mats: 2678 Calories daily expenditure (RMR + Activity)

2678 C/ 150 C (per serving) = 17.8 servings to fulfill daily caloric need just with whole milk

Fat: 17.8 servings x 8 g/serving = 142.82 g total (over-consuming since RDI for me is ~85 g)

• Law requires the following on a label:

• # of servings per container

• serving size

• # of calories per serving

• % of total fat (including saturated and trans fat), cholesterol, sodium, total carbohydrates (including fiber & sugars), protein, vitamin, and minerals

• % Daily Value

• Based on 2,000 to 2,500 calorie/day

• If you require more or less, your personal daily value will change (make adjustments based on RDI on food labels)

• 65 grams of fat is based on 2000 C diet.

• Mats 2678 C: [65/2000] x 2678 = 87.035 grams of fat/day

• For total carbohydrates, dietary fiber, vitamins, and minerals, your daily value goal is to reach 100%

• Choose foods with a low % daily value for fat, saturated fat, cholesterol, and sodium

• Footnote will include:

• An upper limit for total fat, saturated fat, trans fat, sodium,cholesterol, and carbs (dietary fiber; minimum amount).

• Based on sound research for optimal body function.

• Calories per gram for Fats, Protein, and Carbohydrates.

• Observe serving sizes

• # of servings per container

• Compare the total # of calories in similar products

• Keep fat and sodium to a minimum

• Shop for low fat food items and lower calorie staples

• It is possible to eat healthy even if you are busy.

• Quick service & low prices

• High in fat and calories

• Low in many essential nutrients and dietary fiber

• Is it possible to make healthy choices at fast food restaurants???

• Look at the nutritional info at restaurants (ASK IF THEY HAVE A CHART)

• Broiled, baked, roasted vs. fried

• Look at the portion size

• America has the largest portion sizes in the world

• Sometimes even the kind menu is appropriate

• Is it necessary to take a dietary supplement?

• The best and most preferred method is to eat a healthy diet

• Dietary supplements are often less effective in delivering these nutrients to your body

• Certain conditions and lifestyles may require supplementation (anemia, pregnancy, & vegetarianism)

• Taken in concentrations higher than the RDA, may result in the following:

• undesirable side effects

• toxicity

• interfere with the absorption of other vital nutrients

• CI < Basal metabolic rate + Calories used for activity

• Appetite suppressants

• Metabolism boosters

• Weight loss programs

• Description:help diminish a person’s appetite, cut cravings, increase their overall level of energy and metabolism, resulting in an increase in the number of calories they burn

• Side effects:

• Nutrient deficiencies

• High levels of caffeine or herbal ephedra that cause hypertension, cardiac arrhythmia, myocardial infarcation, and/or stroke

• Examples: Hydroxycut, Xenadrine-EFX, and Trim Spa

• Description:

• Increases your basal metabolic rate

• Appetite suppressants can also act as metabolism boosters

• Increases the building of lean muscle mass & decreases the production of fat

• Caution:long term effects are not known

• Design:

• Utilizes a reduced-calorie diet

• Some are pre-packed foods

• Many have maintenance plans once you have reached your weight loss goal

• Cautions:

• “yo-yo” dieting

• BMR drops

• Examples:Slim Fast, Jenny Craig, & Weight Watchers, Low Carbohydrate – High Protein plans

• May claim that exercise or calorie reduction is not necessary

• Costly

• Emphasizes a particular food

• Atkins diet

• The world's largest organization of food and nutrition professionals,[7] calls the Atkins Diet "a nightmare of a diet."[8] The official spokesperson of the American Dietetic Association elaborated: "The Atkins Diet and its ilk--any eating regimen that encourages gorging on bacon, cream and butter while shunning apples, all in the name of weight loss--are a dietitian's nightmare."[9] The ADA has been warning Americans about the potential hazards of the Atkins Diet for almost 30 years now.[10] Atkins dismissed such criticism as "dietician talk".[11] "My English sheepdog," Atkins once said, "will figure out nutrition before the dieticians do."[12] The problem for Atkins (and his sheepdog), though, is that the National Academy of Sciences, the most prestigious scientific body in the United States, agrees with the AMA and the ADA in opposing the Atkins Diet.[13] So does the American Cancer Society;[14] and the American Heart Association;[15] and the Cleveland Clinic;[16] and Johns Hopkins;[17] and the American Kidney Fund;[18] and the American College of Sports Medicine;[19] and the National Institutes of Health.[20] Atkins suffered cardiac arrest in 2002!

• Extreme results over little time

• "The low-carbohydrate diet produced a greater weight loss for the first six months, but the differences were not significant at one year. The low-carbohydrate diet was associated with a greater improvement in some risk factors for coronary heart disease.

• "Adherence was poor and attrition was high in both groups. Longer and larger studies are required to determine the long-term safety and efficacy of low-carbohydrate, high-protein, high-fat diets. [New England Journal of Medicine 2003]"

• Does not include typical healthy behavior modifications

• Exercise

• Well-rounded healthy diet

• Always includes behavior modification

• Proper nutrition

• Choose a variety of food (vegetables, fruits, whole grains, skim milk, fish, lean cuts of meat, and beans)

• Choose sensible portion sizes

• Check product labels for calories, number of servings, & fat grams

• Regular physical activity

• Mild caloric restriction

• Dynamic aerobic exercise

• Realistic weight loss: 2 lbs/week

• Learn healthy behavior modification

• Lifetime commitment to healthy eating and

regular exercise, one you can follow for a

• Portion sizes, maintain nutritionally sound meals

• “Ideal weight” is sometimes unrealistic

• Natural weight is achieved when a person eats healthy portions of a variety of foods and exercises regularly

• Look yourself in the mirror

• Can’t tie your shoe laces appropriately?

• Eating disorders are potentially life threatening, mental health conditions related to obsessive eating patterns

• Types of Eating Disorders

• Anorexia Nervosa

• Bulimia Nervosa

• Fear of Obesity

• Activity Nervosa

Eating Disorders – Underlying Issues

• A distorted body image

• Always striving for perfection

• A need to be in control

• Low self-esteem

• Depression

• There is a conflict between a desire for perfection and feelings of personal inadequacy

• Causes are numerous and complex

• Psychological factors

• Chemical imbalances

• Emotional disorders

• Family pressure

• Culture

• Society

• Media

• More women than men, but it is believed to be underreported in men

• Individuals living in economically developed nations

• College campuses

• Upper middle class women

• Certain female sports

• Certain male sports

• Define the essential nutrients and describe their roles

• 40 different nutrients are required to maintain good health

• NO SINGLE FOOD SOURCE contains all these nutrients!!!!

• Everybody knows that Captain Crunch has them all!

• Provides the bulk of required energy

• Carbohydrates

• Proteins

• Fats

• 55 – 60% of daily caloric intake

• 4 Calories/gram

• Major source of energy for central nervous system + entire body at >60% VO2max

• Synthesized into glycogen into muscle and liver

• 3 Types:

• Complex carbohydrates

• Dietary Fiber

• Soluble

• Insoluble

• Simple carbohydrates

• 45 – 50% of daily caloric intake

• Low in calories (4 Calories/g)

• Provides a steady source of energy in the form of glucose

• Rich source of micronutrients (vitamins & minerals)

• Food sources: breads, cereals, pastas, grains

• Roughage or bulk

• RDA: 25 – 30 grams/day

• Not digested by the small intestine

• Lowers an individual’s risk of developing CVD and cancer

• 2 types: Soluble and Insoluble

• Aids the body in removing fats

• Reduces blood cholesterol & blood glucose

• Food sources: oats, fruits, barley, and legumes

• Cannot be digested by body

• Increases peristalsis

• Reduces the risk of colon cancer:

• Allows food residue to pass more quickly through the intestinal tract

• Food sources: wheat, cereal, vegetables, and the skins of fruits

• Found naturally in milk, fruit, honey, and some vegetables

• Foods high in simple carbohydrates:

• Candy, cake, soda, and jelly

• “Empty Calories”

• Limit to 10% of daily caloric intake

• In general, rapidly elevate blood glucose levels – high glycemic index – which causes large secretion of insulin

w When intake exceeds usage, stored within the cells as fat, particularly in adipocytes

Complex CHOs

• Generally require more time to break down (lower glycemic index), therefore causing more moderate elevation in insulin secretion

w Have less impact on blood lipid levels

CHO Types

Soft drinks, honey/syrups, ice cream, whole wheat bread, raisins, potatoes, carrots, beer

Moderate GI foods (GI 60-85)

Pastry, pita bread, white rice, orange, popcorn, banana, low-fat ice cream

Low GI foods (GI <60)

Spaghetti, milk, grapefruit, beans, apples, pears, peanuts, and yogurt

Glycemic Index (GI)

The glycemic response to carbohydrate varies depending on the food

Å°

1. Complete an exhaustive training bout 7 days before competition.

2. Eat fat and protein for the next 3 days and reduce training load; this increases the activity of glycogen synthase in response to low muscle glycogen.

3. Eat a CHO-rich diet for remaining 3 days before competition and reduce training load; because of increased glycogen synthesis, more glycogen is stored.

w Reduce training intensity

w Eat a normal, healthy mixed diet with at least 55% CHO

3 days before competition

w Reduce training to daily warm-up of 10 to 15 minutes

w Eat a CHO-rich diet

CHO and placebo drinks were taken every 15 min during exercise

Hypoglycemia

Carbohydrate intake during exercise does not produce the same hypoglycemic effects as pre-exercise intake. This difference may be caused by increased muscle fiber glucose uptake during muscle contraction that decreases the need for insulin during exercise, or insulin-binding sites may be altered during muscular activity.

Ergogenic Properties of CHO

w Maintaining normal blood glucose levels may allow the muscles to obtain more energy from blood glucose, sparing liver and muscle glycogen reserves.

• Activities over 1 hour can be enhanced when carbohydrate is consumed within 5 minutes of, over 2 hours before, and at frequent intervals during the activity.

• Within 15-45 minutes before glucose loading may cause hypoglycemia and reduce performance

• Body’s primary source of energy

• 70% at rest

• 25 – 30% of daily caloric intake

• 9 calories/gram

• Types:

• Saturated fats

• Trans Fatty Acids

• Unsaturated fats

• Monounsaturated fats

• Polyunsaturated fats

• Insulation

• Protects vital organs

• Satisfies appetite

• Transports vitamins A, D, E, & K

• Essential in the synthesis of hormones

• Necessary for normal growth & healthy skin

• Many Americans consume 37 – 40% of their daily caloric intake from fats

• Americans lead the world in heart disease

• Cancer statistics:

• Linked to cancer of the breast, prostate, & colon

• 2 rules:

• Do not melt at room temperatures

• Animal products: Meats, lard, cream, butter, cheese, and whole milk

• Increases blood cholesterol & contributor to colorectal cancer

• Typically, does not occur naturally in plant or animal products

• Liquid oils are made into solid fats (hydrogen is added to the vegetable oil)

• Used to extend shelf life and maintain flavor (e.g., fried foods and “store bought” sweets)

• Raises LDL cholesterol

• Derived from plant products

• Monounsaturated found in olives, peanuts, and canola oils

• Polyunsaturated found in margarine, pecans, corn oil, and soybean oil

• 12 – 15% of daily caloric intake

• Most Americans get more protein than they really need

• 45 – 65 grams/day

• Intake should not exceed 1.6 g/kg

• 4 calories/gram

• Composed of about 20 amino acids

• non-essential amino acids: produced by the body (11 out of the 20)

• essential amino acids: unable to be made by the body (9 out of the 20)

Ergogenic Properties of Fat

w Use of FFAs for energy production can delay exhaustion during exercise.

w Chronic endurance training results in more reliance on fat for energy.

w For some individuals, caffeine promotes fat use and improves performance.

• Growth, maintenance, & repair of all body tissues (muscles, blood, bones, internal organs, skin, hair, & nails)

• Maintains normal balance of body fluids

• Needed in the synthesis of enzymes, hormones, and antibodies

• Made up of 20 amino acids

• 9 essential

• 11 non-essential

• Recommendations generally meet energy needs

• Excess protein can damage the kidneys & increase calcium excretion, affect bone health, inhibit muscle growth & endurance performance

Ergogenic Properties of Protein

w Builds fat-free muscle mass.

w Strength athletes need 1.4 to 1.8 g per kg body weight versus 0.8 g per kg RDA (i.e., normal x 2).

w Endurance athletes need 1.2 to 1.4 g per kg body weight versus 0.8 g per kg RDA (i.e., normal x 1.5).

w Diets exceeding 1.8 to 2.0 g per kg body weight per day have not been proven to provide additional benefits and may damage kidney function. Also, excess protein is just converted to fat.

w Supplements are generally not needed providing caloric intake is adequate.

• Regulate bodily functions

• Vitamins

• Minerals

• Needed for metabolism, growth, and development of basic body functions

• Maintenance and repair of eyes, bones, & cellular membranes

• Enzyme reactions

• Metabolism of fats, carbohydrates, & proteins

• Synthesis of red & white blood cells

• Requirements differ for:

• Pregnant women

• Smokers

• 2 categories:

• Fat-soluble

• Absorbed from digestive tract and bound to fat

• Water-soluble

• Absorbed from digestive tract bound in water

• Vitamins: A, D, E, & K

• Transported by fat cells & liver

• Not excreted in urine

• Can build up to toxic levels

• B Vitamins & Vitamin C

• Must be replaced daily

• In excess, these vitamins are excreted through urine & sweat

• Important role in bodily functions

• Enzyme functions

• Muscle contraction

• Nerve function

• Water balance

• Acid-base balance

• Blood clotting

• Contained in hard parts of the body: nails, teeth, bones

• Two groups:

• Macrominerals: 100 mg or more/day

• Microminerals: less than a 100 mg/day

• Suppress cell deterioration

• “slows the aging process”

• Vitamins: C, E, & A

• Carotenoids, Flavenoids, & Selenium

• Food sources: see Table 4.8

• “Forgotten nutrient”

• 60% of the body comprised of water

• To prevent dehydration:

• 2-3 eight ounce cups prior to exercise

• 4-6 oz. every 15 minutes during activity

• Rehydrate after activity

• See table on the progressive effects of dehydration

• overweight

• deconditioned

• unacclimitized

• not eating breakfast

• younger and older

• 40 different nutrients are required to maintain good health

• These nutrients are responsible for growth, repair, maintenance of tissues, regulation of body process, and providing energy

• Carbohydrates, Fats, and Proteins provide energy in the form of calories

• Vitamins and minerals regulate bodily functions

• For total carbohydrates, dietary fiber, vitamins, and minerals, your goal is to reach 100% of the RDA

• American Dietetic Association

• www.eatright.org

• General Nutrition Site

• www.healthy.net/index.html