American Obesity

Obesity:
in America
What’s the population of the USA?
What’s the population of the USA?
310,644,000
That means
•201,918,600
• Out of
Americans
•310,644,000
• Are obese
Why has obesity increased so much in America?
BMI = Body Mass Index
• BMI = ( Weight in Kilograms / ( Height in Meters x Height in Meters ) ) • In other words: how tall you are compared to how much you weigh.
Obese dogs??? Why does this happen?
Why are Americans so fat?
• • • • • • Lifestyle? Food? Exercise? Genetics? Overeating? What do you think?
Most scientists agree that the main cause of obesity is this:
• Too much fatty food
• Not enough exercise
Some scientists believe that obesity is genetic
• • • • • • • • Genetic =遗传 Gene =基因 Hereditary =世袭 Heredity =遗传 Inherited Trait Trait =特征 Characteristic =特征 Genetic Trait
• A study by academics from the University of California and Northwestern University claimed that "the causal link between the consumption of restaurant foods and obesity is minimal at best." • It argued that a tax on high-calorie food, as proposed by many health campaigners in the US and Britain, may therefore not be an effective way for governments to tackle the problem.
Transgenic Mice Could Solve The Obesity Epidemic
“fat-gene” found in mice
• • By tweaking an enzyme in mice, researchers expected to get rodents with low cholesterol, but fatty livers. Instead they found a switch which might be a weight loss miracle. The researchers from the University of Alberta bred a mouse lacking a single enzyme that's associated with fat metabolism — triacylglycerol hydrolase (TGH). TGH is partly responsible for releasing triglycerides from the liver where they go on to form very low-density lipoproteins (VLDLs), which are considered "bad" cholesterol. The scientists thought that breeding a mouse deficient in TGH would have fewer VLDLs, and instead found the mice that not only had lower cholesterol, but also system wide metabolic improvement — seemingly without downside. The researchers hypothesized that removing the TGH would mean the more fat would build up in the liver, as the mechanism by which the fat was released was missing. Instead of getting tiny rodent foie gras, the triglycerides were burned almost immediately rather than being stored, and the liver compensated by synthesizing less fat. The rodents ate more, but also expended more energy, and showed no change in body weight compared to their normal cousins.
This is a real picture of the world’s fattest man. He weighed almost 2000 lbs (about 900 Kg)
Morbid = about death
Even many American Pets are obese.
• This cat weighs 18.5 Kilograms. • The average weight of a healthy cat is 4.5 kgs.
In America, childhood obesity is becoming a bigger problem every year.
Currently, in the USA, 1 in 5 children is obese
Morbid Obesity is a growing problem. (Morbid obesity = life threatening)
Americans eat a lot of cheese!
• Americans now eat an average of 33 pounds of cheese a year, nearly triple the 1970 rate. Cheese has become the largest source of saturated fat; an ounce of many cheeses contains as much saturated fat as a glass of whole milk.
High fat food are very popular in America:
• • • • • • • • Cheese Sour Cream Whipped Cream Whole Milk Half & Half Butter Margarine Partially Hydrogenated Vegetable Oil Milk Solids Lard Shortening Mayonnaise
Carbohydrate =糖类
Do Americans eat too much cheese?
• While Warning About Fat, Uhile Warning About Fat, U.S. Pushes Cheese Sales
• • • •
You can find some of these ingredients in most popular American foods. However, they are rarely found in Chinese food.
Fast food restaurants 'not to blame' for American obesity
• The primary source of these extra carbohydrates are sweetened beverages, which now account for almost 25 percent of daily calories in young adults in America. Consumption of sweetened drinks, and sweets in general, is believed to be one of the main contributors to the rising rates of obesity.
Cheese: Good for economy, bad for obesity problem
• Then help arrived from an organization called Dairy Management. It teamed up with Domino’s to develop a new line of pizzas with 40 percent more cheese, and proceeded to devise and pay for a $12 million marketing campaign. • Consumers devoured the cheesier pizza, and sales soared by double digits. “This partnership is clearly working,” Brandon Solano, the Domino’s vice president for brand innovation, said in a statement to The New York Times. • But as healthy as this pizza has been for Domino’s, one slice contains as much as two-thirds of a day’s maximum recommended amount of saturated fat, which has been linked to heart disease and is high in calories.