I read "Primal Body, Primal Mind", and among many valid points, the one that stuck out to me was the authors strict insistence on avoiding the consumption of fat in the presence of carbs. Healthy fats are great but you shouldn't pair them with carbs because that will cause weight gain. Soooooo..... should I not be coating my sweet potato in butter or olive oil when baking?? Should I avoid sauteeing my veggies in CO? I'm confused!
“The deleterious effects of fat have been measured in the presence of high carbohydrate.
A high fat diet in the presence of high carbohydrate is different than a high fat diet in the presence of low carbohydrate.” ~Richard Feinman, PhD
When we speak of "high carbohydrate" in this context, we mean sugar and starch, not fibrous veggies (which are fine--even great combined with fat). Fat is less likely to be used as a primary fuel if sugars are present and is more likely to be stored undesirably. With respect to your sweet potato, if you have a weight problem or metabolic dysregulation this is more likely to be an issue. Sweet potatoes are far more fibrous and less "glycemic" than white potatoes, so they are a "better" choice, but I would personally (not telling you what to do) keep that portion to a minimum (especially if functioning in ketosis is your goal) and definitely under 100 grams. My two bits. ~Nora
Well, Nora Gedgaudas is a very low carb promoter. She really doesn't advocate eating root veggies at all, and isn't that into fruit. She does, however, advocate eating fat to satiety with lots of low sugar vegetables and small amounts of meat/eggs. People like Paul Jaminet talk about the importance of adding plenty of fat to your starch to slow down the effect on your blood sugar handling system. I find that with plenty of fat, I feel god including some starchy veggies in my diet. Sans fat, starch is not my friend. Perhaps this is one of those areas where we are all unique, and need to practice self experimentation to determine what works for our own body.
For the bodybuilder wannabe's out there, you might remember this debate from Dr. John Berardi's recommendation on "T-Mag" back in the day. He ends up backing a little away from this recommendation, I believe. Note how one of the roundtable members brings up the word "grok" in the Robert Heinlein context, not in the paleo context :)
If I remember correctly, I did a quick look at pubmed reviews with the exposure being "carb+fat" bolus compared to either alone, and did not find compelling evidence. This was around ten years ago though. Note that this is in isocaloric comparisons.
As mem points out above, this is important for food reward though. Potato alone is very sucky compared to potato+butter+bacon.
Also, large doses of carbohydrate and fat together do have an impact on acute indices of liver health, especially in those with developing NAFLD, NASH, etc.
So long as your calories are in check -- yes those still count -- there's nothing about separating carbs or fats that means a thing.
I recently outlined my own reasons for separating the two but this is from a strategy point of view because I'm not keen on calorie counting. For me, if I eat carbs with minimal fat, or fat with minimal carbs, I'm pretty much OK eating ad libitum. High fat+carb for any extended period will get me in trouble w/o some sort of conscientious control. http://carbsanity.blogspot.com/2012/02/separating-carbs-fats-my-rationale.html