Tim, if you were not on an eating plan, you would be unlikely to think back pain was related to your food, so there may be no reason to suspect it now. Diet can usually worsen problems like that, or make them better, but the root cause of them is usually not diet related.
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As for the person who's brother had the kidney problems, there are basically three things I've read about, that indirectly relate to a lowcarb eating plan, that can cause this:
1. The person has an actual viral infection which is undiagnosed. It can hide for decades and then kill you (and I believe such things *do* have symptoms, but they are masked in the general sluggish conglomerate of 'issues' half our population suffers thanks to diet), or it can be found pretty quickly when one is eating well. Some would "blame" low-carb for causing the virus to suddenly seem like such a big deal, but it did not CREATE the virus--we're only talking about food here, not acts of God or contagion!--and in the end I think that saves people more than harms them.
2. The person has a kidney problem which prevents proper functioning, and as PART of their lowcarb eating plan, begins drinking a ton of water very suddenly. For most people, this is just a lot of water. For people with an existing kidney problem, it can be dangerous. Again this may be "blamed" on someone beginning a lowcarb eating plan, but it really (a) has nothing to do with carbs, and (b) is a pre-existing health condition. Every lowcarb doc/author emphasizes having a complete physical prior to beginning the eating plan. If a person doesn't do this, it is not really their responsibility if some few have a serious physical disease that is unknown and may be affected by something like "drinking a lot of water". Sheesh.
3. An "excess" of protein can result in the kidney not excreting all the urea that the protein is creating and this means kidney stones. However, what is "excess" is the real question. Lowcarb eating plans are not "high protein". Sometimes bodybuilders do "super high protein" diets. But lowcarb diets are ADEQUATE protein. Again, unless there is some actual pre-existing problem with the kidneys, there is no reason the body should have a problem with even the maximum protein that any lowcarb doc recommends as part of the eating plan.
Lowcarb eating is, for the most part, basically eating like humans have been eating for several million years. Every instance (and there are very few) of medical issues I've heard of with a person on lowcarb was stuff either completely unrelated (like thyroid) or that was a pre-existing medical condition (although, one they might not have known about, this is an example).
So, the doctors who said that "lowcarb caused" the kidney problems of your brother are simply being "general", not specific. They're not lying or wrong they are just inexact, perhaps because they were talking to your brother and not another doctor, and I assume your brother is a layman.
Because the kidneys either had a pre-existing problem where they couldn't handle much water or protein or the sudden higher functioning of the body brought a pre-existing virus to light, then it would certainly seem that his switch to lowcarb IS what 'caused' these problems to surface. That's understandable.
That is not about lowcarb though, that is about your brother's undiagnosed medical problem, which finally getting enough water and protein into his diet suddenly made apparent.
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I first did Atkins for only three weeks, as a 'trial' (I wasn't sure it was worth bothering with, as none of about 1001 other 'diets' have worked for anybody in my family).
By day 10, my severe constant acid reflux had totally vanished.
My chronic flatulence (good grief!) had totally vanished.
My severe asthma had mostly vanished--actually it was gone except when I was under stress, or spent a long time lying down, or the weather changed suddenly.
My severe allergies vanished.
My respiratory doctor was upset that I quit taking a ton of medication. I explained that since I no longer had the symptoms being medicated, I saw no need to take the medicine, which since I'm self employed was costing me a fortune anyway.
I was upset that he had never once, neverEverEverEver suggested that FOOD could be in any way related to my health issues. I mean he oughtta know. I was really offended. And then that HE was offended because I quit taking numerous inhalers every day, when I clearly didn't need them! I really liked the guy until that point. I haven't seen him since.
My energy level went from being almost nonexistent, and me being nearly unconscious in the early afternoon, to being vastly more energetic. My family was teasing me about how it was my "special diet" responsible for me out happily shoveling snow, which they couldn't have imagined me doing otherwise.
My sleeping schedule, which was terrible as I was chronically insomnic, actually (humorously) got worse for awhile because my energy amped up so much, but then started evening out.
My overall daily 'mood' was vastly more calm.
I didn't have a scale, so I couldn't measure that, but I'd never been able to reach my old truck radio with my seatbelt on (not enough room), and suddenly it was easy. I'd never been able to wear my coat and get the seatbelt on, and suddenly I could. That was in less than three weeks.
After three weeks, I considered staying on it, I felt so damn good. But throughout that time I'd told myself, "It's only three weeks. You can have something later. Just do three weeks seriously." So, my kid had been begging for McDonalds, and when 3 weeks was up, we went to McDonalds.
By the next morning, I was bloated again. I had asthma again. It was hard to wake up again. I was so weary again. My knees ached again. Several things I hadn't even noticed had improved with eating lowcarb, I now noticed when they came back!
I quit eating that crap and stayed on basic LC, and then tried again, this time Taco Bell. Same result but quite a bit less. I did this, eating some 'fast' food or restaurant food maybe once every three days, for a couple of weeks, to see the result that stuff had on me. (To my surprise, Subway sandwiches nearly wiped me out--they were as bad as McDonalds for my body. Go figure.) Eventually I decided that in addition to the lousy effect of carbs, I am apparently allergic to wheat gluten, corn meal, and milk, and since one of those three is in nearly everything, well....!
I didn't go back on LC. I didn't feel like my life was organized enough to do it successfully and I'd read about the dangers of 'yo-yo'ing. I figured 'someday'.
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It was my cardiologist who later wrote a 'prescription' for the Protein Power Life Plan book by the Eades, though last time I saw him he told me he is about 98% vegetarian and lives on soy meat-fakes. Yeah, HE can afford to.
But anyway, so a year and a half after being OFF LC, I found myself selling its endless virtues to a friend of mine who I thought would really benefit from it.
The more I talked the more I longed for feeling that decent again. The more I came back to the forum (I'd been lurking off and on) to get refs for him, the more I realized what I'd given up.
So 11 days ago I went back on lowcarb. My body responses were actually not as extreme this time as last time, and I suspect my weight/size loss is likely a bit less as well, but that's ok.
In 11 days, my energy has come up enough to allow me to do more cooking and housework in the last week than I have done in many months combined.
My complexion is clearing up again.
My mood is much more stable.
My knees quit aching.
My bloating went down considerably.
My brain is CLEARER. I can think more clearly, pay attention for longer periods of time, as if a fog is lifting.
And already there are at least small signs that I am losing size.
And I LOVE this eating plan. OK, I'd really like it if I could live on carby donuts and feel this great, but I can't. So instead I live on a whole lot of awesome foods, meals and snacks that seem so good it seems impossible this could be healthy AND sponsor weight loss too. The deep dish pizza quiche with pepperoni crust alone is so good I just laugh at people who think this is a 'diet' and it must be really hard or something.
I was in the store today, walking through the aisles, looking for the natural peanut butter which they hide with the natural jams several aisles over from the main bulk of that stuff (like, so as not to tempt anybody with it I guess!). All I saw was sugar, sugar, sugar. I picked up a spice bottle of a pepper blend. The second ingredient was sugar. I looked at the baskets of people passing me and felt pity.
I'm sorry it took me nearly 300lbs to find this eating plan and to realize it resolved the apparently severe IR most of my family has. But I am sorrier for the people I see with baskets loaded with carb crap. They will be listing their 101 symptoms and diseases and health issues from now until they die. And they will never suspect the slow, insidious poison that is killing them. How tragic.
PJ