CommunitySide Effects

Reta and Low Carb equals Some Dizzy Spell?

43 replies12 peopleFeb 22, 2026☆ Follow
Summary

Can retatrutide plus a low-carb diet trigger lightheadedness or dizzy spells?

Participants link the episodes mainly to low blood sugar during physical work, reduced overall calories, and the GLP-1 signal that can push glucose lower. Alcohol is noted as an extra factor that may deepen those dips, while dehydration or electrolyte imbalance from higher water intake is also discussed. Several people report that adding back some carbs before activity or using an electrolyte mix resolved similar feelings, though a few maintain very low carb intake without problems once adapted.

What this discussion establishesWhere people disagree

Whether strict very-low-carb intake eventually stalls metabolism or causes fatigue for most people on these drugs, or whether it works fine once adapted

Still open

The exact trigger behind the original poster's two mild episodes

Nothing here is advice.

43 replies · 12 people
PlainAlder11archiveopening postFeb 22

After seeing Reddit mentioned elsewhere I checked it out and was surprised by what I found. A few people there described getting lightheaded or even passing out. That made me think about my own two quick lightheaded moments this past week. We have cut way back on carbs lately, skipping pasta and bread. I still drink two to four beers daily. My recent blood work looked fine and blood pressure was normal. The only other thing that stands out is the hard digging and concrete work I did for a flagpole base, which left me wiped out. Could the lower carbs on this medication be the issue?

SharpCinder28archiveFeb 22

Might not be the same thing, but there is a condition called pseudohypoglycemia that can feel similar. Next time it happens check blood pressure right away in case it is orthostatic hypotension. Also look at urine color to see if dehydration is playing a role.

PlainAlder11archiveFeb 22

I keep a blood pressure cuff and oxygen monitor at home. My readings stay normal. I have been drinking a lot of water lately.

SharpCinder28archiveFeb 22
↳ replying to @PlainAlder11

Drinking that much water can sometimes make things worse unless electrolytes are replaced at the same time.

PlainAlder11archiveFeb 22

I went ahead and ordered an electrolyte powder mix.

LevelThistle44archiveFeb 22
↳ replying to @PlainAlder11 (opening post)

Hard effort while on this medication seems to need some carbs to avoid blood sugar dropping too low. I have felt off a couple times and quick carbs fixed it. Reports of similar feelings, even blacking out, show up now and then beyond just stomach issues. Out of curiosity, why cut the carbs in the first place?

SlowLedger42archiveFeb 22

You are kind of working against your metabolism in two ways at once. Removing the usual daily carbs already requires several days to adjust. Then the false GLP-1 signal tells the brain food just arrived, so it expects more carbs that never show up and releases extra insulin anyway. It is not surprising if the body pushes back for a while.

PlainAlder11archiveFeb 22
↳ replying to @LevelThistle44

I did push myself too hard that day and I am sixty-six, not forty-five. On the carb side I am still eating decent ones, just not the white refined stuff, and I dropped the ice cream and sweets. Weight loss is the main goal. I started this thread after reading things on Reddit and after overdoing the physical work last week.

PlainAlder11archiveFeb 22
↳ replying to @SlowLedger42

Thanks for the input. To clarify, I am still getting decent carbs, just avoiding the white refined ones and the sweets. I began the thread mainly because of what I read on Reddit and because I overdid the work last week.

LevelThistle44archiveFeb 22

Both times I felt off happened before activity when I had not eaten much yet. On this medication my daily targets are one-fifty grams protein, one hundred grams carbs, and fifty grams fat under twenty-two hundred calories. Yesterday most carbs came from fries, a soft-serve cone before lifting, and a lollipop afterward.

SharpCinder28archiveFeb 22
↳ replying to @LevelThistle44

There is also the everyday tiredness that can come from eating fewer carbs and calories on these medications, even when doing nothing at all, plus whatever else from the GLP-1s that can add to brain fog.

PlainAlder11archiveFeb 22

All of this is exactly why I joined this group. You do not see this level of detail elsewhere online.

BlueMarble65archiveFeb 22

My best guess is low blood sugar. The body may burn alcohol first and leave less for maintaining glucose. After three drinks my readings show a clear drop a couple hours later, and even two can affect it noticeably. Testing blood sugar would help confirm.

LevelThistle44archiveFeb 22
↳ replying to @SharpCinder28

So far my energy has stayed decent. Part of that may be because I started testosterone replacement five weeks into the other medication. I began tracking calories and macros the same day and have averaged around one-thirty grams of carbs daily, with the lowest week at one-thirteen. Down thirteen pounds since starting testosterone replacement and twenty-eight total since December. Since January the only days I skipped exercise were three for recovery from soreness and one while traveling.

SlowLedger42archiveFeb 22
↳ replying to @PlainAlder11

I am mostly teasing, but the body really does need time to adjust to big changes. Making two large shifts at once will challenge it more. There is nothing wrong with staying low-carb on this medication and some would say it is even better because it helps break the habit of processed foods.

SlowLedger42archiveFeb 22
↳ replying to @BlueMarble65

That is a good point I missed at first. The two to four beers a day could be happening during the same hours when the lightheadedness shows up, rather than later in the evening. Having both alcohol and the medication lowering average blood sugar can make the low points dip a bit deeper.

PlainAlder11archiveFeb 22

The beer habit has been on my mind for a while. It just fills me up now and is not enjoyable anymore. It was never a real problem before, but it makes sense since I started this early February. I appreciate all the input.

SharpCinder28archiveFeb 22
↳ replying to @PlainAlder11

I agree there's no safe level of drinking these days. Back when, I'd order wine with meals because folks claimed it helped the heart along with that little lift it gave. These days I mostly go for plain water or plain hot coffee instead. Nonalcoholic beers aren't terrible if you want something close. Edibles once felt pretty harmless too, yet one small study found they can damage the lining of blood vessels. Some liver specialist posting online claims plain coffee works better than anything else for that organ. NAC helps the liver quite a bit on top of its other uses.

SlowLedger42archiveFeb 22
↳ replying to @SharpCinder28

I am pretty skeptical of those studies claiming no healthy amount of alcohol. Observational data cannot really prove an absolute conclusion like that. Without controlled experiments it is hard to know for sure, so I treat the strong claims as overstated. I only drink a few times a year anyway, so I have no personal stake beyond pointing out weak conclusions.

KeenMeadow35archiveFeb 22

I find staying low-carb really hard and my energy drops fast. I think I either need to go fully keto or keep a moderate amount of carbs.

SteadyQuill55archiveFeb 22
↳ replying to @SharpCinder28

My second husband was an alcoholic so I kept non-alcoholic versions around as a compromise when I needed him sober for something. It did not actually work, but I was young. I drank them myself out of solidarity and ended up liking the taste. They are basically soda without the extreme sweetness.

SharpCinder28archiveFeb 22

The non-alcoholic option has only five grams of carbs. It could almost be considered a health drink because of the hop antioxidants. For comparison some vegetable juices have nine carbs and barbecue sauce can reach twenty.

PlainAlder11archiveFeb 22
↳ replying to @SharpCinder28

I do not like the taste of the non-alcoholic versions. Honestly it is not about the buzz, I just enjoyed the regular ones. As I said they fill me up now so I will probably drop them. This thread turned into a beer discussion.

SharpCinder28archiveFeb 22
↳ replying to @PlainAlder11

And hopefully sugar-free barbecue sauce too.

PlainAlder11archiveFeb 22
↳ replying to @SharpCinder28

We actually keep some of that and have used it for years.

SharpCinder28archiveFeb 22
↳ replying to @SharpCinder28

Oh wow. He also has steak sauce, teriyaki, and others.

CopperSparrow86archiveFeb 22
↳ replying to @SlowLedger42

What I have noticed is that staying low-carb on this medication or similar ones eventually slows my metabolism to a stop. I need a refeed period with carbs for a week or more, then I can go back to losing. Right now I have added carbs again and at least I am not stalling the way I was. I also find it impossible to feel satisfied when keeping carbs very low on these medications.

BlueMarble65archiveFeb 23

One nice thing about these medications is the ability to eat a reasonable amount of carbs without issues.

CopperSignal27archiveFeb 23

It may not have much to do with the medication itself. I do not know how much exercise or physical work you normally do. It is entirely possible to get these episodes just from sudden hard physical effort plus not many calories or enough fluids and electrolytes. Your body is clearly not happy with what you put it through. Rest, fluids, and food are probably what it needs. I remember fainting and getting sick after going to the gym on an empty stomach when I was younger.

PlainAlder11archiveFeb 23
↳ replying to @CopperSignal27

I think that is probably it. I had not done anything close to that level of work since last summer, but I got impatient. At sixty-six I should know better and either write the checks or have my oldest help. I have been fine since that one day.

NorthThistle22archiveFeb 23

At the risk of repeating others, I would guess lack of calories, especially carbs, is the main factor. The first couple weeks on this medication I could eat almost nothing and still function and train fine, but that was not sustainable. I learned I need carbs and calories to keep workouts going. I had very similar symptoms in the gym and later realized it was from too few carbs. Increasing them and total calories helped a lot. I am still pushing my glycogen stores but I am close to my leanness goal.

PlainAlder11archiveFeb 23

Thanks, I think we have it figured out.

SharpCinder28archiveMar 19
↳ replying to @SharpCinder28

It tastes bad and needs more carbs for flavor. Glad I only bought one can.

WryBramble37archiveMar 20
↳ replying to @PlainAlder11

Adding the electrolyte mix made a big difference for me. There are many brands and flavors, some with caffeine.

PlainAlder11archiveMar 20
↳ replying to @WryBramble37

I have not taken any in a long time. The last time was maybe a month ago when I was moving landscape rock. It was hot that day. I mixed it in a water bottle and it is still in the garage fridge.

SlowTimber14archiveMar 20
↳ replying to @PlainAlder11 (opening post)

My household skips every form of carbohydrate and runs into no trouble at all. Daily intake stays under five carbs which keeps the weekly total below twenty five grams going back to twenty twenty one. Test results come back perfect with nothing out of place. At fifty nine years old standing six feet and weighing one hundred seventy pounds with thirteen point five percent body fat. Too much ease leads to a slow fade. 🫡🔥

KeenMeadow35archiveMar 20
↳ replying to @SlowTimber14

That is interesting. I feel terrible on less than twenty-five grams. I might try again. My partner has me eating pasture-raised chicken and bison now and I no longer like the taste of regular meat. I would like to do low-carb with high-quality meat.

KeenMeadow35archiveMar 20
↳ replying to @SlowTimber14

That is interesting. I feel terrible on less than twenty-five grams. I might try again. My partner has me eating pasture-raised chicken and bison now and I no longer like the taste of regular meat. I would like to do low-carb with high-quality meat.

PlainAlder11archiveMar 20

If you eat anything you are getting some carbs. It just depends on the amount. You need carbs for energy and they should be good ones.

SlowTimber14archiveMar 21
↳ replying to @KeenMeadow35

Ground beef makes up a huge part of what we prepare but I take big sirloin chunks and cut them down into plenty of steaks with a couple smaller roasts for the crockpot. On another note the dog ends up enjoying fantastic leftovers from dinner ❤️

KeenMeadow35archiveMar 21
↳ replying to @SlowTimber14

Bulk sirloins sound good. Something to consider.

PlainAlder11archiveMar 21
↳ replying to @KeenMeadow35

They are good. We have a local butcher who does excellent work. The steaks are tender and they make great homemade sausage too.

SlowTimber14archiveMar 21
↳ replying to @KeenMeadow35

There are plenty of videos online showing how to break down the cuts.

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