_chris wrote:
@ Spence, I've always planned meals around balancing carbs, protein and fat, why do you reccomend alternating carbs/fat? Carbs are needed to keep your energy stores up and blood sugar etc. is what I had always thought and so I planned my meals to always include all 3. I'm not disagreeing as such, but trying to understand alternative ways of doing things.
Sorry for the not so swift reply mate.
The reason I suggest alternating carbs and fats in meals has alot to do with (endogenous) insulin. Insulin is very anabolic. It's responsible for carb and amino acid delivery to the muscles for recovery and growth. Insulin shuttles nutrients into muscle cells, however chronic insulin elevation will cause the muscles to become insulin resistant and refuse to take up nutrients. On the other hand, adipose tissues will continue to take up nutrients at a rapid rate, and will lead to fat gain. So you need insulin, but you need to control it. And when you eat to promote insulin surges, you've got to be sure that you have the ideal profile of macronutrients (Proteins Fats, Carbs etc) in your blood to ensure that this insulin surge leads to muscle gain and not fat gain.
Now meals containing just protein and carbs do produce a synergystic release of insulin, causing high blood levels of insulin, carbs and amino acids, however the macronutrient ratio is just right to promote anabolism in which the body takes all those nutrients into the muscle cells for protein and glycogen synthasis.
To ensure that you are not promoting chronic insulin elevation, which would lead to reduced insulin sensitivity, it is advised to alternate these protein/carb meals with protein/fat meals. Taking in 30% of each major class of fatty acids (polyunsaturates, monounsaturates, saturates) is a good way of including essential fatty acids which are so important to health, performance and a favorable body composition.
On top of all that, protein plus fat meals will provide energy and amino acids without causing large, lipolysis-preventing insulin spikes. In addition, after fatty meals that contain no carbs, the body oxidizes less carbs (more carbs are stored and retained in the muscle as glycogen) and burns more fat for energy. So basically you'll be burning fat for energy and storing carbs in the muscle after such meals. Which is another bonus.
Hope that sheds some light on my original comment.
Spence