Reta 和低碳水化合物饮食会导致头晕吗？

[BNLFL]

在另一个帖子里有人提到Reddit之后，我就过去看了看。哎呀！总之，有人提到头晕目眩甚至晕倒，还有其他人也提到过。这让我开始思考，因为过去一周我也有过两次轻微的头晕，没什么大碍，很快就过去了。现在，我们已经大幅减少了碳水化合物的摄入，不吃意大利面、面包之类的。但我每天还是会喝2到4瓶啤酒（碳水化合物）。2月11号我刚去诊所做了血液检查。一切正常，血压125/70，心率70次/分钟。我能想到的唯一其他原因就是，我累得够呛，挖了个25英尺高的旗杆的地基，还放了6袋60磅重的混凝土。因为这里很久没下雨了，地面硬得要命。真是累死我了。

总之，服用Reta是不是碳水化合物摄入不足？

 

[Calm Logic]

可能不适用，但有一种叫做假性低血糖症的情况：

症状 真性低血糖（危险） Reta 假性下丘脑（重置） 感觉头晕 缓慢“消退”；导致昏厥。 站立时 突然感到“头晕目眩” 。 血糖
下次可能需要立即测量血压（如同体位性低血压一样）。检查尿液颜色，看是否有脱水迹象：

步 行动 它揭示了什么 1. 血糖检测 指尖采血或动态血糖监测。 如果血糖 值大于 75 mg/dL ，则 不是 血糖骤降。 2. 血压检查 测试时分别采用坐姿和站姿。 如果血压下降 超过 20/10 mmHg ，则为 体位性低血压 。 3. 补水 检查尿液颜色。 颜色比“淡稻草色”更深表示 脱水 。

 

[BNLFL]

我买了家用血压计和氧气瓶套装。我的血压值正常。最近我喝很多水。

 

[Calm Logic]

最近我喝了好多好多水。

如果你没有同时补充电解质，这有时反而会加剧问题：

谷歌搜索

All GLP medications lower blood pressure directly, and in many reduce fluid intake by direct action on brain thirst centers. Plus the loss of fluid and electrolytes from initial weight loss, all make postural hypotension more likely, which is the more likely cause of the symptoms. If it goes away sitting or lying down , that would confirm it . Doing what you are doing - having a drink and something to eat is fine as a way to deal with it . But I would suggest paying more attention to fluid and salt/electrolyte intake as important to prevent it from continuing to happen.

 

[BNLFL]

I just ordered some electrolyte power mix.

 

[woundcarping]

So, after Reddit was mentioned in another thread, I popped over. YIKES! Anyways, one had mentioned getting light headed and passing out, along with a few others. This got me thinking, as I've had like 2 of slight light headed deals in the last week, nothing major and goes away quick. Now, we've really cut back on the carbs, no pasta, bread, blah blah. I still have anywhere from 2-4 beers (carbs) a day. I was just at the docs office on 2/11 for my blood work tests. Everything was spot on, BP 125/70 and HR of 70bpm. Only other thing I can think of, is I busted my ass digging a footer for a 25' flagpole, and put in 6-60lb bags of concrete. The ground was hard as hell due to it not raining in forever here. It beat the shit out of me.

TL;DR Am I not getting enough carbs taking Reta?

Exertion on Reta likes carbs to keep blood sugar from getting low (hypoglycemia). I’ve had a couple times I felt off, some quick carbs took care of the symptoms.

Anecdotal reports of similar experiences including loss of consciousness are relatively common for the more severe side effects than just GI issues.

Out of curiosity, what is the reason for cutting carbs?

 

[tubby]

I mean you're kind of being a jerk to your metabolism here.

First you take away all the carbs that it's used to getting every day, which is already going to take a few days to a week to adapt to and get used to going without. Then you lie to it with this false GLP-1 signal that keeps getting fed to your brain screaming "I just ate," so it naturally assumes more carbs are getting dumped into your stomach, which (due to not existing) it can't absorb. It kicks out a little extra insulin to help manage those imaginary carbs as well.

Don't be surprised when it's jerk right back to you for a little bit.

 

[BNLFL]

Exertion on Reta likes carbs to keep blood sugar from getting low (hypoglycemia). I’ve had a couple times I felt off, some quick carbs took care of the symptoms.

Anecdotal reports of similar experiences including loss of consciousness are relatively common for the more severe side effects than just GI issues.

Out of curiosity, what is the reason for cutting carbs?

Yeah, I beat the crap out of myself, and pushed too far. I'm 66, not 45. As far as the as the carbs, weight loss, and cutting back a bunch, not totally. I normally don't do that much hard work anymore, just write checks.

 

[BNLFL]

I mean you're kind of being a jerk to your metabolism here.

I do appreciate it. Let me clarify, still getting good carbs, just not white stuff. Also cut out the ice cream, cookies and sweets. I started this thread pretty based on the stuff I was reading on Reddit and when I overdid it last week.

 

[woundcarping]

My two times feeling off were both before exertion, but I hadn’t eaten much at that point of the day.

On Reta, my daily minimum guidance macros are 150g protein, 100g carbs, and 50 grams of fat, under 2200 calories.

Yesterday most of my carbs came from French fries, a soft serve ice cream cone before lifting, and a blow pop after.

 

[Calm Logic]

I’ve had a couple times I felt off, some quick carbs took care of the symptoms.

Not to mention general, daily tirz/reta fatigue from eating less carbs/calories (and whatever else from the GLPs that can cause fatigue), even with doing absolutely nothing (which can increase the GLP brain fog):

Factor Mechanism of Fatigue/Fog Adaptation / Resolution Nutritional Gap Lower carbs/calories mean less immediate glycogen for the brain. Manual Adjustment: Does not "adapt" away; requires intentional nutrient timing or small snacks to fuel the brain. Metabolic Shift Forcing the body to burn fat (ketone production) is "harder" work than burning sugar. 4–8 Weeks: Mitochondria become more efficient at fat oxidation ("fat-adapted"), making the process feel less taxing. Inactivity Lack of movement reduces the "pressor" effect that clears brain metabolic byproducts. Behavioral: Fog persists as long as you stay sedentary; "breaking the seal" with light movement is usually the only fix. CNS Signaling Direct effect on the hindbrain reduces dopamine "drive" and alertness. 6–12 Weeks: Central Nervous System (CNS) desensitization. The "muted" feeling usually lifts once you stop titrating up.

 

[BNLFL]

All of this, is why I joined here. You don't find this kind of info on-line.

 

[GLP1Pharmacist]

My strong guess is low blood sugar, body may burn alcohol over production to keep blood sugar high enough. If my RS has 3 drinks then 2-3 hours later a consistent lowering of blood sugar way to low. Even 2 can impact significantly, so either one or none. Test blood sugar...

 

[woundcarping]

Not to mention general, daily tirz/reta fatigue from eating less carbs/calories (and whatever else from the GLPs that can cause fatigue), even with doing absolutely nothing (which can increase the GLP fog).

So far I’ve been fortunate that energy levels have been decent or better as best I can remember. Some of that fortune is probably related to starting TRT 5 weeks in on Tirz. I started tracking calories and macros the same day as TRT and my carb average since then is around 130g/daily with the lowest week being 113g. Down 13lb since starting trt, 28lb total with GLP since 12/10/25.

Since January, the only days I missed exercising were 3 days recovering lifting DOMS (first day hitting legs went a bit wild), and one day traveling/being lazy.

 

[tubby]

I do appreciate it. Let me clarify, still getting good carbs, just not white stuff. Also cut out the ice cream, cookies and sweets. I started this thread pretty based on the stuff I was reading on Reddit and when I overdid it last week.

I'm mostly just giving you a hard time there, but the reality is that your body needs time to adapt to any significant changes you make and throwing two big ones at the same time is going to challenge it a little more. There's nothing wrong with doing low-carb on reta and some might argue it's a superior approach, to the extent it gets you out of the habit of eating the more addictive processed foods you may have been eating before.

 

[tubby]

My strong guess is low blood sugar, body may burn alcohol over production to keep blood sugar high enough. If my RS has 3 drinks 2-3 hours consistently lowers blood sugar way to low. Even 2 can impact significantly, so either one or none. Test blood sugar...

That's a good point that I missed on my first read of OP. "2-4 beers a day" could mean having them during the day when he's running into this problem, VS having them later in the day, which I assumed on my first reading.

When you have both alcohol and a GLP pushing average blood sugar levels down, that does make the valleys dip just a little bit deeper when you hit them.

 

[BNLFL]

Yeah, the beer thing has been on my mind for while, it honestly just fills me up and isn't really enjoyable anymore. While it hasn't been a real issue in the past, it makes sense since I started this early Feb. As I've mentioned, I do appreciate everyone's input.

 

[Calm Logic]

Yeah, the beer thing has been on my mind for while, it honestly just fills me up and isn't really enjoyable anymore.

Yeah, as they say now, "there is no healthy amount of alcohol." I used to have a glass of wine sometimes when dining out since it was seen then as good for the heart (with the buzz as a bonus), but now I just stick to free water mostly or hot black coffee.

Anyway, @BNLFL, have you tried the zero-alcohol beers? They aren't bad at all. For a buzz, marijuana gummies used to seem almost healthy to me, but they are unhealthy for the endothelium according to a small study (CANDIDE study, 2025).

There is a liver doctor on Reddit that says the best "supplement" for the liver is drinking black coffee. NAC is a good supplement in general, but especially for the liver:

If you are using NAC specifically to protect your liver from alcohol, timing is everything:

Take it BEFORE drinking: Taking NAC an hour or two before alcohol can help prime the liver and prevent damage.

Avoid it DURING/AFTER drinking: Some studies suggest that taking NAC after you’ve already started drinking (or while hungover) might actually increase liver stress or toxicity. It’s best used as a "pre-game" preventative rather than a "morning-after" cure.

 

[tubby]

Yeah, as they say now, "there is no healthy amount of alcohol." I used to have a glass of wine sometimes when dining out since it was seen then as good for the heart (with the buzz as a bonus), but now I just stick to free water mostly or hot black coffee.

Anyway, @BNLFL , have you tried the zero-alcohol beers? They aren't bad at all. For a buzz, marijuana gummies used to seem almost healthy to me, but they are unhealthy for the endothelium according to a small study ( CANDIDE study, 2025 ).

There is a liver doctor on Reddit that says the best "supplement" for the liver is drinking black coffee. NAC is a good supplement in general, but especially for the liver:

I'll throw out there that I'm highly skeptical of those studies on alcohol that suggest "no healthy amount." Not because I've dug into them at a deep level, but simply because it's an impossible conclusion to reach from observational data. So unless China has locked people into rooms and forced some to drink and others not (which would be the only way reach an absolute conclusion on this subject) and I never heard about it, then I'm going to assume the researchers are using weak observational data and pretending it's more definitive than it really is.

That said, I probably only drink alcohol 3 or 4 times a year (it just isn't usually interesting to me) so I have no personal interest in the outcome other than calling out bullshit results when I smell them.

 

[jungletech]

I find low carb really difficult personally and my energy gets very low. I think I need to either be fully keto or moderate carb.