Why am I always tired after lunch?

Have you ever tried one of those wearable blood sugar trackers to see what your blood sugar is doing after you eat?

Since it seems to be after meals, it might be helpful to see if there’s a pattern that is tied to certain foods that are spiking your blood sugar after you eat. Sharp spikes can pull your blood sugar down too low leaving you exhausted.

Have you tried only eating protein at lunch so you do not get a carb induced blood sugar spike? I agree with pm56's comments on wearing a blood glucose monitor so you can track your blood sugar and focus on what is making the spikes and subsequent valleys in your blood sugar levels. When your blood sugar drops after a spike you feel exhausted. Not sure but a specialized Dietician might be able to help you.

Does this only happen after your lunch meal and not breakfast or dinner? I'm only asking because it would seem a sugar spike should occur after other meals too. I'm 73 with PMR and SMM and I get exhausted around 1:00 whether I've had lunch or not. Part of it could be my age but I think it's PMR and SMM related. Fatigue is a symptom of many other disorders too.

This is an old wise tail. Your stomach is now full, so your body is putting all it energy into breaking down the food you ate so that means there’s not much energy left for you to have Energy Like I say it’s only an old wise tail

To pjbcorsi1955 and minnesota10

I'm recovering from a nasty Hashimoto's relapse and have been going through the same post-lunch exhaustion. I agree with minnesoto10. Your parasympathetic nervous system needs energy to process your food, and puts your sympathetic n.s. on notice to back off. I don't know why it's always after lunch and not other meals, but go with it because your body needs the rest and no stress while Hashimoto's is prevailing. What I liken it to is not swimming right after lunch (to prevent cramping); and, cortisol is usually trending downward and hitting bottom around 3 pm. My post lunch naps have been helpful and are dissipating as I'm recovering from the Hash relapse. Best wishes in your healing journey. Don't feel guilty. Listen to your body--REST AND RELAX!
As you probably know, cortisol is a big factor in Hash--so when it ebbs, take advantage of it.

@barb123456
Me too and most of the time when I eat gluten.

This is what I have found:
Severe post-lunch exhaustion during a Hashimoto's flare is primarily driven by blood sugar rollercoasters, sluggish digestion, and immune-mediated inflammation.
Blood Sugar Dips: Reactive hypoglycemia or mild insulin resistance, common in hypothyroidism, causes a sharp glucose spike.
Low Stomach Acid: Hypothyroidism frequently reduces gastric acid and pepsin output.
Hidden Food Triggers: Eating inflammatory or sensitive foods (like gluten, dairy, or soy) during an active flare provokes an internal immune strike, magnifying fatigue.
Diverted Blood Flow: Digestion pulls a large volume of blood toward the gut; a compromised metabolic baseline struggles to supply both the stomach and brain simultaneously.
I finally became aware of it the second time I ate my homemade chicken pot pie, after switching to meals centered on lean protein, healthy fats, and high-fiber, non-starchy vegetables while cutting back on simple, refined carbohydrates.

33: 11 Overlooked Strategies to Overcome Thyroid Fatigue
https://thyroidpharmacist.com/articles/podcast/ep-33/

@swalex
Thx for your reply. I appreciate your perspective and insight. It's amazing how far reaching Hashimoto's can be and I relate to all that you shared. I have been gluten- and soy-free for years--dairy has never been a problem, thank goodness. But the two former are like poison to me. I followed Dr. Wentz for the first couple of years after being diagnosed in 2018. BTW, appreciated your link today and enjoyed her perspective once again.

It seems the more we know, the more we don't know! I am humbled every day by new information, research and studies that re-shape my perspective on the challenges of this disorder. There is a site on-line that articulates this better than I can--about the complexities we all share: "The Hashimoto’s Epidemic: Here’s Why—and What You Can Do." [had to remove URL as a new member--sorry]

It seems that I went in to a tailspin and protracted relapse last October after getting my second Prolia injection for osteo. In April I went back to my Endocrinologist for the third, and a month later, crashed a second time. Far be it for me to expect her (the specialist) to inform me that 5 to 10% of us will have delayed adverse effects that can last 5 to 6 months in waves. So this October I will not be accepting another Prolia injection. Having lost months of my life to pain, suffering and being severely incapacitated--it is answered prayer that I stumbled on to this connection.

Our medical system is truly fractured and shame on the specialists that dispense prescription drugs for not knowing and informing the recipients of this risk factor. Should we expect more from Endocrinologists, Rheumatologists and Orthopedists--those allowed to treat osteoporosis pharmacologically.

You seem very knowledgeable and have a different perspective than I do. I'd appreciate your feedback--for regardless of age this is a dilemma that many women will ultimately have to face. I think my years of sub-clinical Hash set me up for the osteo. It does not run in my family.

Again, thanks for sharing and I wish you continued success on your journey to optimal health. You've got it together. Congrats!

@barb123456
Hi Barb123456,

Thank you for recognizing my concerns—I truly appreciate it.
I’m familiar with the Palomo article and mentioned it when I was asked about my thyroid condition.

I have chosen not to take osteoporosis medications because I am concerned about their potential side effects. I do not have EBV, but laboratory testing detected HHV-6.

I also have osteoporosis alongside several other health conditions, including lupus and other autoimmune issues. In addition, I have MRI-confirmed spinal stenosis, have undergone surgery at L4, and have laboratory-confirmed hypercalcemia. My thyroid condition was confirmed by scintigraphy, and my adrenal insufficiency, for which I must take hydrocortisone, was confirmed with an ACTH test.

To help prevent further harm, I believe we need to educate ourselves about our conditions, harmful environmental influences, and the possible side effects of medications.

I wonder how many people live with different symptoms for years without receiving a proper diagnosis.

I hope the Prolia injections alleviate your symptoms and wish you all the best. If you can, please keep us informed. Thank you.

@barb123456 I have long covid with autoimmune features and experience the same thing. What other people have mentioned—blood sugar, the body is using energy to digest food,etc. —all sound right. I would just add that for me, lunch also serves a divider between two phases of the day, even if I eat little and make it quick. In the morning, I tend to have more energy and adrenalin makes me want to do things. I always hope to keep that flow going even though I know I should pace myself better. Then lunch introduces a natural pause—I stop whatever I’m doing and sit down for at least 5 min. It’s enough for the body to say “wait a minute, I’m actually really tired!”. So once lunch happens, it’s like my body starts craving more rest and the exhaustion becomes more difficult to ignore. Where I’m going with this is that your post-lunch fatigue may be an important message, your body’s way of saying you have been using up too much energy during the morning. And the only way to avoid or postpone that slump may be to take more breaks during the morning hours. For me, it sometimes helps to lie down around 11am for 20-30 min of absolute rest (no reading the news, checking email etc.). I hope this helps!

I have been dealing with the same issue for roughly 10 years. 7 years ago, I was diagnosed with non-hodgkins lymphoma. It was an aggressive form but still early stages. Chemo took care of it and have not relapsed. Once treatments were completed, I still got tired only after lunch. My doctors told me that the fatigue would improve as I continued through recovery. I can go a few days with no problem. Then there will be a couple of weeks where every day, I can't function without a short nap. What others have suggested about monitoring glucose levels is something to consider. I tried a lighter lunch, or rather more of just a snack. That made a difference for me. My glucose level is checked often by my doctor but if checked when there isn't a drop won't tell my doctor anything. Slowly increasing my exercise level has also helped. It has not stopped the issue but these are just some suggestions to try. One thing I was told over and over during chemo to keep my strength up was to make sure and get plenty of protein. They suggested adding something like Boost or Ensure. The others that suggested looking at diet, especially adding protein may be a good place to start. I hope you find something that will work for you.