Is my anxiety actually blood sugar? How a glucose dip feels like panic
A woman tells me she has anxiety. It arrives around eleven in the morning and again around four. Her heart races, her hands shake, there is a dread she cannot attach to anything. Then she eats and within twenty minutes it lifts. She has been offered a prescription. Nobody asked what she had for breakfast. Some of what she has is anxiety, and I take that seriously. Some of it is blood sugar falling and the body sending adrenaline to catch it, and from the inside those two feel identical, because the same chemistry drives both. I want to show you how to tell them apart, why this shows up when your hormones are out of balance, and what to ask for.
What a blood sugar dip does to your body
Eat carbohydrate on its own and glucose rises fast. Insulin chases it, and in a body making too much of it, or making it late, it overshoots, and two to four hours later glucose is falling below where it started. The body treats a falling blood sugar as an emergency. It releases adrenaline and cortisol to push glucose back up, and adrenaline is the hormone of a racing heart, shaking hands, sweating, a tight chest and a sense that something is wrong. That is the exact symptom list of a panic attack. The brain, which runs on glucose, adds irritability and trouble thinking on top.
A study of over a thousand healthy adults wearing glucose monitors found that the people whose glucose dipped further two to three hours after a meal were hungrier, ate again sooner, and ate more over the whole day. A smaller study looked at people sent to a clinic for unexplained palpitations and dizziness and gave them a sugar drink. Most of them dropped below 70 mg/dL four to five hours later, and the anxious, shaky symptoms tracked the timing of their insulin more than the glucose number itself. You do not need a true low to feel it. The fall is enough.
Why it shows up when your hormones are out of balance
Estrogen helps your cells hear insulin. As it starts to swing in perimenopause and falls after menopause, cells listen less well, so insulin runs higher, the spike after a meal is taller and the dip after it is deeper. In PCOS the insulin resistance is the condition itself, which is why so many women with PCOS are told they have anxiety before anyone runs a fasting insulin. Issue 012 explains why fasting glucose can look perfect while this is happening.
Cortisol makes it worse. A nervous system that never stands down keeps glucose available all day, which means bigger swings, and a short night measurably worsens insulin resistance the next day. Then there is the pattern most of my clients arrive with. Coffee first, no breakfast, a salad at one, wine at eight. That is four blood sugar drops a day, and the body sends adrenaline for every one of them.
And real anxiety is common with a hormonal imbalance too. Estrogen fluctuation affects serotonin and the calming receptors in the brain, many women feel anxious for the first time in their lives in perimenopause, and anxiety is more common in women with PCOS than in women without it. Both things can be true at once. I am asking you to find out how much of yours is food, because that part you can change this week.
How to tell the two apart
Blood sugar anxiety keeps time. It comes two to four hours after a meal, or after a long gap, or in the middle of the night after alcohol, or the morning after wine. It is worse after a carbohydrate heavy meal and it lifts within twenty minutes of eating.
Anxiety that is anxiety keeps company with a thought or a situation. It comes with the email, the meeting, the phone call from your mother.
Other things dress up as anxiety and get missed. An overactive thyroid causes racing heart, tremor, feeling hot, weight loss and anxiety, and a low TSH is the clue. Low iron causes palpitations and breathlessness that feel like panic. Estrogen swings in perimenopause cause palpitations on their own. Each is one line on a panel, usually read by someone who was not looking for anxiety.
If you want a closer look, there are now two over the counter glucose monitors in the US that anyone can buy, with a sensor that lasts about two weeks and costs somewhere between fifty and a hundred dollars. Wear one for two weeks, eat normally, and mark the moments the dread arrives. If the line is falling every time, you have your answer. These devices have no alarms and are not for people prone to true low blood sugar, and the line is information for you and your doctor, never a diagnosis.
Adrenaline does not know whether a thought sent it or a falling blood sugar did. It feels the same either way.
What I would do first
Eat thirty grams of protein at breakfast, within an hour or two of waking. Issue 020 is all about it. For most women it takes the eleven o'clock episode away inside a week.
Never eat carbohydrate on its own. Protein and fiber with every carbohydrate, at every meal, and eat the protein first. The order changes how the glucose lands.
Walk for ten minutes after your largest meal. Muscle takes up glucose without insulin, and the dip after the meal gets shallower.
Have the coffee after food.
Keep a two week log of every episode against what you ate and when, and how long it took to lift after eating.
Take the alcohol out for two weeks and watch the nights.
Get the panel: fasting insulin alongside fasting glucose, HbA1c, a full thyroid panel with antibodies, ferritin and high sensitivity CRP. And do not use fasting or a very low carbohydrate diet as the fix while you are still running on cortisol. For a body that is braced, big gaps make the swings bigger.
When to push harder with your doctor
Most of the above is food, and for most women it is safe. There are exceptions and they matter.
If you take medication for diabetes, especially insulin or a sulfonylurea, these symptoms can be a true low blood sugar and that is dangerous, so speak to whoever prescribes it before you change anything. If you are pregnant, dips and palpitations need your midwife's eye and your protein needs are higher anyway. If you take thyroid medication, a dose that is too high produces this exact picture, so ask for free T4 and free T3 alongside TSH. If you take a blood thinner, keep your leafy greens consistent as you change your meals and tell your clinic. If you have a history of disordered eating, food logs and rules about what to eat first can reopen a door, so say so and let a professional who knows that history help you.
Push harder if a measured glucose has ever been under 55, or under 70 while you had symptoms that went away when you ate. That is a workup for true hypoglycemia. Push harder if the anxiety comes with weight loss, tremor, feeling hot all the time or a racing heart at rest, and ask for the thyroid panel by name. Push harder if you have panic attacks that do not track food at all, because anxiety with a hormonal imbalance is real and treatable, with therapy and with medication, and food is the floor under that treatment, never a replacement for it. The Menopause Society reviewed the evidence and found hormone therapy does not consistently reduce anxiety on its own, though it remains the most effective treatment for hot flashes, and when flashes and broken sleep are driving the anxiety it can help. That is a conversation for a menopause trained doctor.
And if anxiety ever comes with thoughts of harming yourself, that is today. In the US you can call or text 988.
I do not diagnose, order tests or treat. I read the log next to the folder and tell you what I see as one picture, and if it needs clinical care I say so and I send you.
FAQ
Can low blood sugar feel like anxiety?
Yes, and it is one of the most common things I see mistaken for it. When glucose falls the body releases adrenaline to push it back up, and adrenaline produces a racing heart, shaking, sweating and dread. That is the same chemistry as a panic attack. The difference is timing. Blood sugar anxiety comes two to four hours after a meal or after a long gap, and lifts within twenty minutes of eating.
Why do I feel anxious a few hours after eating?
Usually because the meal was carbohydrate on its own and insulin overshot. Glucose rises fast, insulin chases it and pushes it below where it started, and the body sends adrenaline. With perimenopause or menopause this gets worse because estrogen swings make cells hear insulin less well, and in PCOS the insulin resistance is the condition itself, so the spike is taller and the dip deeper. Protein and fiber with the carbohydrate, and a short walk afterwards, flatten it.
Can a hormonal imbalance cause anxiety on its own?
Yes. Estrogen fluctuation affects serotonin and the brain's calming receptors, many women feel anxious for the first time in perimenopause, and anxiety is more common in women with PCOS. That anxiety is real and it is treatable. What I ask is that the blood sugar part is taken out first, because it is the part you can change in a week, and what is left is much easier for you and your doctor to see clearly.
Should I use a continuous glucose monitor to check?
It can help. Two over the counter monitors are now sold in the US, a sensor lasts around two weeks and costs roughly fifty to a hundred dollars. Wear one, eat normally and mark the moment each episode starts. If glucose is falling every time, you have your answer. They have no alarms and are not for people prone to true low blood sugar, and the trace is information for you and your doctor, never a diagnosis.
What tests should I ask for if I think my anxiety is blood sugar?
Fasting insulin alongside fasting glucose, HbA1c, a full thyroid panel with antibodies, ferritin and high sensitivity CRP. Fasting glucose alone will look fine for years while insulin climbs. The thyroid and iron lines matter because an overactive thyroid and low iron both produce palpitations and anxiety that food will not fix. I do not order tests. I help you read them together.
In good health,
Yvette Rose
Sources
- Wyatt P et al. Postprandial glycaemic dips predict appetite and energy intake in healthy individuals. Nature Metabolism, 2021.
- US Food and Drug Administration. FDA clears first over-the-counter continuous glucose monitor, 2024.
- Teede HJ et al. Recommendations from the 2023 international evidence-based guideline for the assessment and management of polycystic ovary syndrome. Journal of Clinical Endocrinology and Metabolism, 2023.
- The North American Menopause Society. The 2022 hormone therapy position statement. Menopause, 2022.
- 988 Suicide and Crisis Lifeline.
This is general wellness education and not medical advice, diagnosis or treatment. Talk to a qualified professional, especially if you are pregnant, nursing, taking medication or managing a condition.