Have you noticed a decline in mental energy or focus since not doing “cardio”? I have read several reports that indicate that aerobic exercise is best for mental performance. Any thoughts?
Thanks to reader Phillip for his question on the comment boards. I’ve talked a lot over the course of the last few months about chronic cardio and the very real disadvantages of this type of training (higher cortisol levels, oxidative damage, systemic inflammation, depressed immune system and decreased fat metabolism, etc.). However, just because I don’t do chronic cardio anymore doesn’t mean I don’t get huge cardio benefits from the high intensity sprints and other interval exercises I do. This high intensity part of my workout is short compared with the hours I used to used to spend training. I choose to consider efficiency as a factor in my training program, and (as I’ve said on a number of occasions) I’ve never felt better than I do now.
What are your thoughts on Barry’s suggestion that there is some sort of problem in cooking O-3 enhanced eggs? I’ve seen similar things related to flax seed oil and roasted & toasted walnuts, etc. What is the bottom line on cooking with omega-3s?
Polyunsaturated fats (which include omega-3 fatty acids) are, indeed, very prone to oxidation when exposed to heat, light or oxygen. This oxidation essentially renders them rancid to some extent, and this will result in less appealing taste (and smell) as well as decreased nutritional value. Add to that the damage imposed by the resulting free radicals, and that “healthy” food has now become a health hazard.
Can you give me more explanation about nuts and seeds? I eat a ton of them and am always confused about which ones are actually nuts and which are seeds and which are legumes. Does it make any difference if you eat them whole, roasted, raw or as nut butter?
I received tons of emails from last week’s Gene Expression: Location, Location, Location post. Thanks to everybody for their feedback and questions. In the comment section of last week’s post, Ed was interested in other concrete examples of gene expression (the ability of a gene to produce a biologically active protein). In personal emails, others asked for more explanation of the difference between genes and gene expression. Still others wanted to hear more about the interaction between their gene expression and lifestyle choices. Given the range of reader questions this week, I thought I’d reframe this week’s Dear Mark to include more of an overview of this recurring MDA theme. There’s a lot to be said on the subject, and I promise this post won’t be the last word on it. Nonetheless, there’s no time like the present to give a proper introduction and dive right in.
Let me just say that gene expression is one of my favorite areas of interest, and it’s truly at the heart of the Primal Blueprint. In fact, it’s the real beauty of it as well. It confirms that the day-to-day choices we make have incredible impact. And we can influence gene expression to a far greater degree than anyone ever thought possible.
I keep hearing news stories about how alcohol is good for you, but I wonder how that figures in with the Primal Blueprint. What’s your take? Can I have that beer when I come home from a long hard day at work and not feel guilty?
It’s true that we tend to hear a lot about a given piece of advice publicized again and again with a slightly different spin from varied studies. While researchers will often pursue subjects that are “timely,” I sense the media (popular and even medical journals to some extent) is more the influence in this case.
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