Yes, it is a very welcome, unexpected benefit, Jo.
It's Friday fast day and I'm enjoying my black coffee in bed now. I've actually been thinking about the health benefits of IF (besides weightloss) and wondering how to measure the results. I think most of the benefits that have been researched would require doing before and after blood tests and scans and so they're beyond me. But there might be others that I can 'feel' - but not after only 2 weeks, of course!
Anyway, I've been meaning to summarize the science / theory on this, mostly for my benefit but for whoever is interested
Apologies in advance for the mega-post, but hey, some of you might have long commutes with nothing to read
Part of the appeal of IF for me is of course the paleo/primal connection: the fact that our modern lifestyles are largely inappropriate for our caveman genes. Our ancestors did not have food available 24/7, and fasting between meals, hunting on an empty stomach, etc. was a normal way of life. It's funny that going without food is now seen as such a terrible thing. Whether that's a reaction to marketing and consumer culture, or because we associate hunger with poverty, famine, etc, who knows. But mention 'skipping meals' to most people and they'll tell you what a bad idea it is.
More recently, the buzz is that IF can help improve overall health and longevity. This is a pretty tall claim, but studies do back it up (mostly on animals, but the human evidence seems to be growing now).
On the weightloss side, it obviously lets you cut your overall calorie intake, but also helps by shifting your body from burning sugar/carbs to burning fat as its primary fuel, and reducing cravings for sugar and snack foods - I've experienced the second one already.
The fat-burning benefits seem to come down to glycogen. It takes about six to eight hours for your body to metabolize your glycogen stores and after that you actually start to shift to burning fat. However if you are replenishing your glycogen by eating every few hours, you make it far more difficult for your body to actually use your fat stores as fuel.
Other researched health benefits of intermittent fasting include:
* Normalizing insulin and leptin sensitivity, which is key for optimal health (insulin resistance is a primary contributing factor to nearly all chronic disease, from diabetes to heart disease and even cancer)
* Improving biomarkers of disease
* Normalizing ghrelin levels, also known as "the hunger hormone"
* Reducing inflammation and lessening free radical damage
* Promoting growth hormone production, which plays an important part in health, fitness and slowing the aging process, promotes muscle growth, boosts fat loss by revving up your metabolism, etc.
* Lowering triglyceride levels
* Preserving memory functioning and learning (and has been shown to protect brain cells from changes associated with Alzheimer's and Parkinson's disease)
* Decreased blood sugar concentrations
* Decreased blood pressure
* Decreased heart rate
* Enhanced immune function
* Reduced body fat
Anyway, that's the science and I guess I always knew the evidence was out there, but fasting just sounded too difficult, painful, etc. I won't lie: it's not 'fun' to be hungry, but it's also waaaaay easier than I ever imagined. It's Friday morning now and I'm halfway through fast number 4 (I've been doing Monday/Friday fasts for 2 weeks) and all I have to do is skip breakfast and lunch and then eat something around 6. And then pray for a nice surprise on the scales on Monday!
A couple of references below for the really keen
http://fitness.mercola.com/sites/fitness/archive/2012/08/24/intermittent-fasting.aspx
http://fitness.mercola.com/sites/fi.../28/intermittent-fasting-health-benefits.aspx
http://www.bbc.co.uk/news/magazine-25549805
Happy weekend everyone!
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