Thursday, September 3, 2009

09/03/2009

WARM UP
800m Jog
20 Box Jumps
20 PVC Overhead Squats

WOD

ANGIE - Time to get someone's name on the PR board
100 Pull ups
100 Push Ups
100 Sit Ups
100 Air Squats

Good Luck!

Below in an excerpt from www.marksdailyapple.com. Here's the link for the full article.
http://www.marksdailyapple.com/the-context-of-calories/


200 Calories Food

200 Calories is 200 Calories. Right?

CONTEXT IS IMPORTANT

“What’s that in the road ahead?” vs. “What’s that in the road!? A head!?”

...Fats aren’t just for fuel either. They can be integral parts of all cell membranes and hormones and can serve as critical protective cushioning for delicate organs. At what point do the fats we consume stop becoming structural and start becoming calorically dense fuel? Depends again on the context. If there’s a ton of carbohydrates accompanying the fat on a daily basis, it’s pretty certain that that fat will be stored as adipose tissue sooner rather than later. That’s nine calories per gram in the tank for future use (if ever). And that’s what adds up over time when you weigh yourself. OTOH, if you’ve withheld carbs for a few days and your insulin remains low, the fats from this meal might be used quickly to provide fuel for normal resting metabolic processes.

Keep your carbs low enough long enough and you get into ketosis, a fat-burning state that creates what many now refer to as the “metabolic advantage.” In this context, fats are fueling most of the body’s energy demands either directly as fatty acids or as the fat-metabolism byproducts called ketones. To the delight of those looking to burn off unwanted fat, it gets better. The body balances the acidic effect of any excess ketones by either excreting them in the urine (in today’s $5 a gallon economy, isn’t that wasting fuel?) and by using ketones and fatty acids to create a bit more glucose for the brain via gluconeogenesis in a fairly “energy inefficient” process.

Finally, let’s look at the lowly carbohydrate and its four calories per gram. All carbs are broken down into simple sugars, and eventually (and almost always) into glucose. The primary use of glucose from all carbohydrate food is as fuel, whether burned immediately as it passes by different organs and muscles or whether stored for later use. The brain, red blood cells, and nerve cells prefer glucose as primary fuel (but don’t absolutely require it – they can use ketones). Muscles that are working hard will prefer glucose if it is available, but don’t absolutely require it unless they are working very hard for very long. If it is not burned immediately as fuel, excess glucose will be first stored as glycogen in muscle and liver cells and then, if or when these glycogen storage depots are full, it will be converted to fatty acids and stored in fat cells as fat. The things to remember about carbs and to put into context: Carbs are not used as structural components in the body – they are used only as a form of fuel; glucose in the bloodstream is toxic to humans UNLESS it is being burned immediately as fuel. (For reference, “normal” blood sugar represents only about one teaspoon of glucose dissolved in the entire blood pool in your body). That’s why insulin is so critical to taking it out of the bloodstream and putting it somewhere FAST, like muscle cells or fat cells. Moreover, humans can exist quite easily without ever eating carbs, since the body has several mechanisms for generating glucose from the fat and proteins consumed, as well as from proteins stripped from muscle tissue. For all these reasons, in the PB-style of eating, carbs are lowest priority. Unless your context includes lots of endurance activities (or storing fat) there’s little reason to overdo the carbs (USDA and RDs’ recommendations notwithstanding).

So what’s the take home message from all this? To be honest, I thought maybe you could tell me! Maybe it’s that by understanding how these metabolic processes work, and knowing that we can control the rates at which each one happens through our diet (and exercise) we needn’t agonize over the day-to-day calorie counting. As long as we are generally eating a PB-style plan and providing the right context, our bodies will ease into a healthy, fit, long-lived comfort zone rather effortlessly.

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