A good read : The truth about fat .. from RunNow

Shropshire1959

Fat has an unfortunate reputation. It is all too easy to believe that eating fat makes a person fat. Indeed, for many years most diet experts believed that it did, and many do even today despite compelling evidence that eating a fairly high-fat diet is no more likely to cause overweight than eating a high-carbohydrate or high-protein diet.

For example, in a 2002 review called “The Influence of Dietary Composition on Energy Intake and Body Weight,” Roberts et al. noted the following:

1) Fat calories as a percentage of total calories in the American diet had fallen over the preceding 20 years while overweight and obesity rates had increased drastically

2) Studies designed to determine whether people eat more calories when they eat more fat have generally concluded that they do so only when the energy density of foods is not controlled, suggesting that energy-dense foods rather than fat are the cause of weight gain

3) Studies investigating the effects of reduced fat intake on weight loss have shown that reduced fat intake results in very little weight loss when calories are not controlled, suggesting that it is an excess of calories in general rather than of fat in particular that causes weight gain.

The anti-fat doctrine that prevailed for so long in society also prevailed in sports. Generations of endurance athletes, in particular, were schooled to aim for a 60-percent carbohydrate, 20-percent protein, 20-percent fat macronutrient breakdown in their diet. That’s a low-fat diet for sure, since the average American gets 34 percent of his or her calories from fat. While the carbohydrate piece of this formula stood on reasonably sure scientific footing (although it has been modified recently into a recommendation that carbohydrate calories as a fraction of total calories should vary with training volume), the fat piece never had any scientific support. In fact, much of the relevant science indicated that more fat was better.

For example, a study from the University of Buffalo found that female runners who got 30 percent of their calories from fat were significantly less likely to get injured than those who ate less fat. It is not likely that the extra fat itself protected the less-often-injured runners, however. Rather, those who ate the least fat probably did not get enough total calories to meet their bodies’ needs.

Another line of research has shown that higher-fat diets increase fat oxidation during prolonged exercise and may thereby increase endurance. Researchers from New Zealand compared the effects of a 14-day high-carbohydrate diet, a 14-day high-fat diet, and an 11.5-day high-fat diet followed by a 2.5-day carbo-loading diet on fat oxidation and performance in a 15-minute cycling test and a 100-kilometer cycling test. Performance in the 15-minute test was slightly better after the high-carb diet, but not to a statistically significant degree, while performance in the 100km test was slightly better, but again not to a statistically significant degree, following the high-fat diet. Fat oxidation was significantly greater during the 100-km test following the high-fat diet.

Other studies have found that high-fat diets reduce performance in shorter time trials by reducing carbohydrate oxidation. However, recent research indicates that endurance athletes can have the best of both worlds by maintaining a habitual higher-fat diet in training and then switching to a high-carbohydrate diet before competition. These studies have shown that the high-fat diet adaptation of increased fat oxidation capacity persists through the carbohydrate loading period, which in turn ensures that carbohydrate oxidation capacity is not compromised in competition.

A study from the University of Cape Town in South Africa found that a 10-day, 65-percent fat diet followed by a three-day, 70-percent carbohydrate diet increased performance by 4.5 percent in a 20km cycling time trial preceded by a glycogen depletion ride.

It also bears noting on this topic that the typical endurance athlete gets 30 to 35 percent of his or her daily calories from fat — substantially more than the minimum. Indeed, even most elite American endurance athletes maintain relatively high-fat diets. The fact that our most gifted runners, cyclists, rowers, etc. are routinely able to win national championships on a high-fat diet is the best possible proof that a high-fat diet is not inimical to endurance performance.

Based perhaps in part on this common sense consideration and the relevant science, the American Dietetic Association and the American College of Sports Medicine now recommend that athletes get 20 to 35 percent of their calories from fat. Gone is the notion that the minimal adequate level of fat intake is also the optimal or even the maximum acceptable level of fat intake. It is now recognized that many athletes can perform equally well at a range of fat intake levels, and that some individual athletes may need to experiment before they find their personal “sweet spot” within that range.

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About The Author: Matt Fitzgerald is the author of numerous books, including Racing Weight: How To Get Lean For Peak Performance (VeloPress, 2012). He is also a Training Intelligence Specialist for PEAR Sports. To learn more about Matt visit www.mattfitzgerald.org.

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_Zardoz_

I like Matt Fitzgerald but I will say he is cherry picking a lot of studies there. As there is quite a bit of quality research disputing some of what he is saying. I'm not saying he's wrong I'm just saying he's approached his article with the idea that fat is good and looked for research saying that. Rather than going out looking for research on fat and seeing what the conclusion is. It's a mistake a lot of these articles make.

It's an interesting read but needs to be taken in context with a lot of other things. Thanks for posting it

Shropshire1959

I like Matt Fitzgerald but I will say he is cherry picking a lot of studies there. As there is quite a bit of quality research disputing some of what he is saying. I'm not saying he's wrong I'm just saying he's approached his article with the idea that fat is good and looked for research saying that. Rather than going out looking for research on fat and seeing what the conclusion is. It's a mistake a lot of these articles make.

It's an interesting read but needs to be taken in context with a lot of other things. Thanks for posting it

You're welcome.

You may also me right .. Cherry Picking does appear to be an international sport these days... we see it every day from science to new articles.. It's jolly difficult to get to the bottom line truth through the smoke screen of Opinion.

The search goes on.

Have fun

Beachlady24

Thanks for sharing the article. I love fruit and veggies more than most people, but sometimes you just gotta have a nice juicy steak~! :smokin:

Shropshire1959

Thanks for sharing the article. I love fruit and veggies more than most people, but sometimes you just gotta have a nice juicy steak~! :smokin:

You're very welcome

ukaryote

That article and similar have been around. If the studies are only preformed on elite athletes and extremely fit people ,then I do not feel they are necessarily applicable to Joe Couch Potato. Like, I don't give a rat's paootie. It is similar to suggesting Tabata intervals to a 40 yo guy who is a beginner at exercise.

Those athletes can intake enormous amounts of any calories because they are burning through them every day. A fellow who crossed Antarctica on foot prepared by drinkig 2 cups of olive oil per day and put on lots of fat weight to have enough reserves for the long hike. I'm not slamming down olive oil, and I'm not burning 5000 calories per day.

As to low fat diets, gee, they don't mention maintaining a calorie deficit. Or include exercise as a necessary component of fitness.

My personal macro for fat is 10 to 20% of calories. If I shoot lower than the suggested maximum of 30%, then I can probably stay under 30%..