Fat-burning during workouts

[e.e.cummings]

What do you make of this comment (taken from a book I bought at Costco -101 Fat-Burning Workouts & Diet Strategies). Preparation for cardio workouts:

'If your main cardio goal is to burn fat - lots of it - then avoid carbs altogether. Multiple research studies show that when you don't eat carbs before aerobic exercise, more bodyfat is burned. But that doesn't mean you should run on an empty stomach. Japanese researchers reported in the journal Perception and Motor Skills that when athletes consume only amino acids before aerobic exercise, they burn even more fat than when they drink water alone. Reach for snacks that deliver about 5-10 grams of fast-digesting protein (they suggest either a scoop of whey protein in water, 2 hard boiled egg whites, turkey or chicken breast, or canned light tuna).'

Thought or experience with this?

[redrhodie]

Any diet advice that eliminates an entire macronutrient is not healthy in my opinion.

[DebbieDowner]

I know from personal experience carbs do nothing for me. Protein is a much better option for me. I think it is a body by body need.

[indysteel]

I'd like to see those studies. I think there are other variables to consider, too. Is it a morning workout (when you've likely depleted your stored glycogen overnight) versus an afternoon or evening workout when you might still have some stored glycogen from whatever you've ingested during the day? How long and/intense is the workout? What I need to eat before a hour-long spin class is different than what I need for a multi-hour ride. I also think studies suggest that men and women burn fuel sources somewhat differently (I'm recalling a study I read about discussing how men and women process energy drinks consumed during exercise).

Like redrhodie, I'm suspicious of the advice. I'm no expert, but my gut tells that it's a simplistic take on how our bodies fuel aerobic exercise.

[ny biker]

I eat lots of carbs. Waffles everyday for breakfast, sandwich or pasta at lunch, baked potato or pasta for dinner most nights. I've lost plenty of fat on this diet.

Studies have shown that eating before morning exercise helps you work out longer and at greater intensity, so you burn more calories. And that is how you lose fat.

Your body digests carbs faster than it digests protein or fat. So having just protein before exercise means you're more likely to have GI problems from undigested food.

If you want to buy a book, buy Nancy Clark's Sports Nutrition Guidebook. She is a registered dietitian who focuses on athletes.

[limewave]

Okay, I know someone will be able to find this . . . It wasn't that long ago someone posted an article about how men and women burn energy differently. And it said something along the lines that women don't need to carbo-load like men do. And that women should stick to lean proteins . . .

Anybody else remember this?

[mirliluck]

I eat lots of carbs. Waffles everyday for breakfast, sandwich or pasta at lunch, baked potato or pasta for dinner most nights. I've lost plenty of fat on this diet.

Me too. Well, maybe not that much but close.

I visit another health and fitness forum where a lot of the people there are really into weightlifting, and they constantly promote protein protein protein, all the while singing the evils of carbs. Admittedly I did notice a difference in satiety when I increased my protein and was more conscious of my intake in general, but I personally had HORRIBLE luck trying low-carb. It had a really negative impact on my cycling.

I've read that success with one vs. the other has to do with insulin resistance levels in the body, which vary by person.