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They call it 'keto flu'. I didn't get it; maybe a little.
It'll pass. Maybe 3 days to a week. After 21 days you'll be swinging it. After decades of relying on carbs as fuel, changing over to being a lean-mean-ketogenic-fat-burning-machine can have a few bumps.
Try to be strict, especially during your first 21 days. Primal Endurance reckons that after doing this for a while, we can dip in and out of being ketogenic; our bodies become accustomed to both ways of eating.
I don't know if that's true; in things like this there's a lot of 'bro science', so for me it comes down to experimentation.
Low Carb High Fat...
High fat? I cant belive its good for you to eat a lot of butter, bacon and read meat, your colestrol will increase and your blood pressure aswell.
The 'fat is bad' for you is based on outdated and bad science.
Ancel Keys was one of the first to promote this myth when he observed fat blocked drains. He did a study called The Seven Country study and cherry picked his findings.
They also did stuff like feed rabbits a high fat diet and they all got heart disease. Rabbits produce all their own cholesterol, so adding yet more wasn't going to be good for them. And had they done the same experiment using dogs, they would've gotten a totally different result.
There is no evidence that fat is bad for you.
But I understand that we've had the 'fat is bad' drummed into us from an early age, while we're chugging down fruit juices, which were advertised as healthy, which is basically just sugar water (carbs).
Is that what I said? No. There's no reason to be rude and arrogant.
It's not @techie's fault; we've had the 'fat is bad' for you and 'move more, eat less' since the late 70s, early 80s.
People are conditioned to just believe this as fact.
'Low Carb High Fat' just sounds mental to begin with.
It sounds like it's just another fad.
It also brings up connotations of bacon and cheese.
Dr Michael Mosely (he'll be known by the British members here) calls it the 'Blood sugar diet', because eating low carb high fat is a method to control your blood sugar. Or he calls it the 'traditional Mediterranean style diet' (which has nothing to do with pizza and pasta) which is also low carb high fat. The 'high fat' of LCHF tends to turn people off, but it's not exactly what you think it is (if you're thinking it's just bacon and cheese).
He gives a talk here titled "How to stay healthy and what the latest science tells us" which covers the above points, and more...
My alcoholic nature made sure I did a fair bit of research (internet based ahem) before embarking on this way of eating (it's not really a diet as such).
I'm currently reading Breathing Underwater by Father Richard Rohr. He's a Catholic monk, but a contemplative who has been influenced by Thomas Merton, who brought back the contemplative tradition by spending years learning from Zen Buddhists.
It's a commentary on A.A.'s 12 Step program; he makes the point that religion shouldn't be about a 'belief system', that belief systems divide, and that religion really should be about a practise of doing.
It's all kind of Buddhist I think.
I've thought about giving up coffee for lent, as a spiritual exercise, but then my mind says, "Look, you've given up alcohol, smoking, donor kebabs, crisps (chips for Americans), and sugar (apart from the odd relapse), you're not giving up coffee too!"
So it looks like I'm giving up, giving up for Lent.