Nov 16th, 2013
Author: CrossFit CDR
Category: CDR Community
Did you know…Obesity
The United States is in the midst of an obesity epidemic, where more than 35% of US adults are obese, and about 32% of US children are considered overweight or obese. Researchers predict that obesity rates will exceed 44% by 2030 if we follow this current trajectory. Obesity is defined as having an excess in body fat, whereas overweight is defined as having an excess body weight for a given height from fat, muscle, bone, water, or a combination of these factors. Below are the currently used BMI cut-off points that define underweight to obese weight ranges:
What is BMI?
BMI (body mass index) is your weight divided by your height
squared, [weight (kg) / [height (m)]2. This calculation is
a pretty reliable indicator of your body’s fat mass.
Being obese increases your risk of developing CVD (cardiovascular disease), Type 2 Diabetes, stroke, certain cancers, disability, and early death. Its estimated that people with a BMI>30 lose about 2-4 years of life versus healthy weight adults, and those with a BMI>40 lose about 8-10 years, which is comparable to that of a smoker! Obese children are at risk for pre-diabetes, bone and joint problems, sleep apnea, being obese as adults, as well as social and psychological problems due to stigmatization or low self esteem.
WHY? From 1970-2010, the average amount of calories consumed for a US adult increased from 2,169 to 2,614. An increase of 42% of these calories came from added fats and oils. The use of HFCS (high fructose corn syrup) in the food supply per capita increased from .3 lbs to 28.7 lbs.
Rates of childhood obesity and overweight have increased due to a lack of health education in schools, a lack of physical activity, a decrease in the consumption of fruits and vegetables, and an increase in the consumption of SSBs (sugar-sweetned beverages).
What does BMI mean to a CrossFitter?
I’m sure many of you are concerned with your body fat or your body fat percentage, I mean one the reasons why we come here is to get a six-pack…or at least a 2-pack. However, BMI can be tricky when used to calculate the body fat percentage of a very-well muscled individual. Remember that big 5 lb. block of fat sitting outside T-mac’s office? Well that 5 lbs takes up ALOT of space compared to our very dense and compact muscle tissue of the same weight. This means that someone could weigh more than what is “prescribed for their height” if they have a lot of muscle mass. Bottom line: BMI is still a very useful tool for doctors and nurses when screening and monitoring patients for obesity and obesity-related problems, but it may not be the best indicator to measure your body fat as an athlete. My recommendation is to do under-water weighing, which is considered to be the GOLD STANDARD of body fat measuring to accurately assess your fat mass to fat-free mass (muscle, organs, bone, etc.) ratio.
Workout of the Day
Warm-up: Tabata Core Killers
Next week is partner week, so remember to grab a friend for Wednesday ‘s WOD and your sweetheart for Friday’s WOD!
CrossFit Kids will be coming back 2 days a week, as always, it is free for members and $60 for non-members
T-mac will be leading a Women’s Only upper body strength class 2 days a week, more details to come!
Sign up for class here!
Body Mass Index. (2011, September 13). Centers for Disease Control and Prevention. Retrieved November 15, 2013, from http://www.cdc.gov/healthyweight/assessing/bmi/index.html
Childhood Obesity Facts. (2013, July 10). Centers for Disease Control and Prevention. Retrieved November 15, 2013, from http://www.cdc.gov/healthyyouth/obesity/facts.htm
FACTS With a Very Heavy Heart Obesity and Cardiovascular Disease (CVD). (2013, March 1). Heart.Org. Retrieved November 15, 2013, from http://www.heart.org/idc/groups/heart-public/@wcm/@adv/documents/downloadable/ucm_305059.pdf