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DO carbs interfere with fat loss?

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DO carbs interfere with fat loss?

Post by Canuck Singh on Mon Mar 08, 2010 2:33 am

Carbohydrates role in human physiology

Do Carbs Interfere with Fat loss?

Scientists assessed the metabolic fate of a carbohydrate meal (pasta) consumed by six healthy subjects after a period of low intensity exercise, moderate intensity exercise and inactivity. The subjects were given a meal of 150 or 400 g of pasta after performing a low intensity exercise session (bike pedaling at well below 50% of VO2 max) or moderate intensity exercise (60% VO2 max). The subjects were also fed these meals after a period of inactivity (no exercise).The metabolic fate of the carbohydrate meal was determined using a labeled metabolic tracer within the carbohydrate structure was studied for 8 hours after consumption.

The results demonstrated that when the subjects exercised at a moderate intensity workload then ate the pasta meal, the fat burning (oxidation) process was not inhibited. In fact, the carbohydrates did nothing to the elevation in fat burning produced from exercise. The subjects all experienced an increase in fat utilization from exercise despite consuming the pasta meal. And remember, this research only examined moderate intensity exercise; high intensity exercise will stoke the metabolism and cause far greater fat utilization. The misconception that “carbohydrate consumption after exercise will switch off the fat burning process” has been blown right out of the water.

Next, when the carbohydrate meals were consumed after exercise, glucose oxidation was significantly reduced. In fact, when the subjects ate the large pasta meal after the moderate intensity exercise session, glucose oxidation was completely suppressed. This lack of glucose oxidation and the fact that a large positive glycogen balance was observed in these subjects indicates that carbohydrates consumed after exercise are exclusively taken up by muscle.

Another pertinent finding from this research was that after exercise, fat storage is completely suppressed. From the data, it appears that after exercise, the conversion of nutrients such as carbohydrates and protein into fat is virtually impossible. In this study, even though a large amount of carbohydrates (400 grams) was consumed after exercise, none of it was stored as fat, the vast majority was absorbed by very hungry and very receptive muscles.

One final important finding from this study was that when the subjects ate the small pasta serving without exercising, none of the meal was stored as fat. The small carbohydrate meal did not “switch off” the fat burning process. Unlike the notion that many “bodybuilding experts” claim, small amounts of carbs consumed throughout the day are not converted into fat, nor do they switch off the fat burning process. The misconception that "carbs are converted to fat" is destroyed. To further support this, remember that despite the subjects eating the larger pasta meal without performing any exercise, only a very miniscule 4% of the total meal was stored as fat! However, this carbohydrate meal did suppress fat utilization for several hours.

The bottom line is that while a large carbohydrate meal won’t be converted and stored as fat, if eaten without previously performing exercise it will prevent fat utilization for several hours. From this research, three important points regarding carbohydrate metabolism have emerged:

1. The conversion and storage of nutrients as fat is totally suppressed following exercise. Even a large serving of carbohydrates is directed toward muscle and not stored as fat if consumed after exercise.

2. Carbohydrates consumed after exercise do not inhibit the fat burning process that exercise invokes. Small meals containing carbs are not converted into fat, nor do they interfere with the fat burning process.

3. Carbohydrates consumed after exercise are used directly to fuel growth and repair of muscle tissue. Glycogen accumulation is an anabolic trigger of muscle growth.

[size=50]1. Folch N. Péronnet F, Massicotte D Duclos M, Lavoie C, Hillaire-Marcel C. Metabolic response to small and large 13C-labelled pasta meals following rest or exercise in man. Bri J. Nutri. (5) 671-680, 2001.
- Thanks to Dr. Cribb for the article[/size]
Canuck Singh
Canuck Singh

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Re: DO carbs interfere with fat loss?

Post by hSingh on Mon Mar 08, 2010 4:01 pm

Small meals containing carbs are not converted into fat, nor do they interfere with the fat burning process.
Did the study report how many grams of carbs would be considered 'small'?


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