5 Signs Your Blood Sugar May Be Out of Balance (And What to Do About It)
Have you ever found yourself exhausted and low on energy, battling cravings all day or noticing your mood swinging for no obvious reason? Or maybe you've dealt with unexpected skin changes or shifts in your menstrual cycle.
Many people chalk these experiences up to being busy, stressed or just getting older. But sometimes, they can be signs that blood sugar isn't as stable as it could be.
Blood sugar isn't just relevant for people with diabetes. It's closely connected to the hormones that influence hunger, mood, skin health and even your menstrual cycle. When blood sugar regularly spikes and crashes, it can create ripple effects throughout the body, since our bodies don't work in silos.
Here are five common signs that blood sugar may be affecting your hormones, why they happen, and simple food-first strategies to help.
First, What Is Blood Sugar?
Blood sugar, or blood glucose, is your body's main source of energy. It comes from the foods you eat, particularly carbohydrates, which are actually your body's preferred energy source, not something to fear.
Throughout the day, your body works to keep blood sugar in a healthy range. Insulin is one of the key hormones that helps with this, moving sugar from your bloodstream into your cells to be used for energy. Think of insulin as a key that unlocks the door to your cells so sugar can move in and fuel your muscles.
The goal isn't perfectly flat blood sugar. Some fluctuation throughout the day is completely normal. What you want to avoid are the big spikes and crashes, often driven by skipped meals or meals low in protein, fibre or fat, that leave you feeling energized one moment and completely drained the next.
Beyond cravings and energy crashes, frequent spikes and crashes (called glucose variability) can cause micro-tears in blood vessels and damage their delicate lining, which may contribute to a higher risk of heart disease.
Over time, your body also needs to release more and more insulin to do the same job, and some people's cells become less responsive to it. That's called insulin resistance, and it's more common than people realize, especially with conditions like PMOS (formerly PCOS).
Insulin isn't just a blood sugar hormone. It's actually a growth hormone that communicates with many other systems in the body, including the ovaries, skin and brain. So when insulin is chronically elevated, the ripple effects can show up in places you'd never think to connect back to what's in your bowls or on your plates.
Sign #1: The Mid-Afternoon Energy Crash
You wake up feeling fine, get through your morning, and then somewhere around 2 or 3pm, it's like someone pulled the plug. You can't focus, and all you want to do is nap.
Why it happens: this pattern is worth examining alongside what you've eaten and when. Did the day start with a structured meal, or a coffee and a granola bar on the way out the door? Are you going four, five or even six hours between meals? And when you do eat, is there enough protein and fibre, or is it mostly quick-digesting carbs?
A meal that's mostly refined carbohydrates, like a plain bowl of congee, bagel with jam or a cereal, digests quickly. You’ll get quick energy with blood sugar rising fast, insulin coming to bring it back down, and without anything to slow that process, blood sugar often overshoots on the way back down too. That dip is very often exactly when the 3pm crash hits.
What to do: instead of cutting carbs (because once again, they’re your body’s primary source of energy), try building meals around a simple framework: PFF (this is your BFF).
Protein: yogurt, nuts, seeds, fish, eggs, tofu, meat, and poultry digest slowly and slow down the overall uptake of a meal when paired with carbs.
Fibre: choose carbs that contain fibre at least half the time, like whole grains, fruit, legumes, beans, and starchy vegetables, for a slower, steadier rise in blood sugar.
Fats: unsaturated fats like olive oil, avocado, nuts, seeds, and nut butters have little impact on blood sugar and help meals feel more satisfying.
A few examples: toast with eggs and avocado, oatmeal with chia seeds, berries, and peanut butter, congee with egg and edamame, or a chickpea salad with vegetables and feta. Meals that combine these three elements tend to keep you fuller, more satisfied and energized for longer.
Sign #2: Skin Changes
This one surprises people the most, since we don't usually think about skin and blood sugar together. Skin health is influenced by many things, including genetics, stress, skincare routine, medications, and other medical conditions, so blood sugar is just one possible piece, and for many people it may not be a piece at all. But it's worth understanding, because it's often completely overlooked.
Why it happens: research links high glycemic load diets with more acne. Glycemic load measures how quickly a specific portion of a specific food raises blood sugar. Pairing higher glycemic index foods with protein and fat can lower the overall glycemic load of a meal and, in practice, meaningfully improve skin health for some people.
Because insulin is a growth hormone, higher insulin levels can influence other hormones, including androgens, which can increase oil production in the skin and contribute to acne in some people, including cystic acne around the menstrual cycle.
Less obvious, but still real, signs of insulin resistance include skin tags and darker, thicker, velvety patches of skin, usually in body folds and creases like the back of the neck, armpits, or groin. This is one reason skin changes are often discussed alongside conditions like PCOS, where insulin resistance and hormonal imbalance commonly occur together.
Not every breakout is caused by blood sugar or insulin, but for some people, supporting blood sugar is worth paying attention to as part of a broader approach to skin health.
Sign #3: Cravings That Feel Out of Control
“I can't stop thinking about sugar.” “I have zero control around snacks.” “Why do I crave sweets every single afternoon?” This is one of the things clients feel most ashamed about, and it is not a discipline problem.
Why it happens: you can't out-think a physiological need. If your body is under-nourished and your blood sugar is all over the place, no amount of willpower will override it, because your body is simply trying to keep you alive and asking for energy, fast. Cravings aren't a character flaw or a willpower issue. There can be a biological response to low energy availability.
What to do: one of the best ways to reduce cravings is eating consistently throughout the day, since skipping meals makes blood sugar fluctuations more likely.
Check in every 3 to 5 hours: notice hunger cues, or if they're hard to feel (which can happen with neurodivergence, a history of disordered eating, trauma, medications, illness, or habit) watch for signs like low energy, trouble concentrating, or mood changes instead.
Include protein at meals and snacks.
Think “nutrition by addition.” Make sure meals are genuinely satisfying using the PFF framework.
Sometimes cravings aren't a sign you need more discipline. Sometimes they're a sign your body needs more fuel.
Sign #4: Irregular Menstrual Cycles
Blood sugar and reproductive hormones are more connected than many people realize. If you've noticed irregular cycles, missed periods, or changes over time, blood sugar may be one piece of the puzzle worth exploring, especially with a condition like PMOS or insulin resistance.
Why it happens: Frequent blood sugar spikes ask your pancreas to release more and more insulin to bring levels back down. Over time, cells can become less responsive to that insulin, leading to insulin resistance.
This matters for PMOS (PCOS) because insulin isn't just a blood-sugar hormone - it also acts on the ovaries. High insulin levels stimulate the ovaries to produce more testosterone circulating in the blood. This is a major contributor to the symptoms many people with PMOS (PCOS) experience: irregular ovulation, acne and excess hair growth.
Over time, that can make regular ovulation harder, which for some people shows up as irregular, unpredictable, or missed cycles. This is exactly why blood sugar management comes up so often in conversations about PMOS (PCOS), since insulin resistance and hormonal imbalance tend to travel together in that condition.
Not every irregular cycle is caused by blood sugar. Stress, sleep, medications, and other medical conditions can all play a role too. But blood sugar is one piece of the puzzle that's often overlooked entirely, and it's one of the more modifiable pieces, which is why it's worth paying attention to.
What to do: the same foundation applies here, balanced meals using PFF, and eating regularly rather than restricting or skipping. This isn't a quick fix, but supporting blood sugar is a legitimate, evidence-informed piece of supporting cycle regularity over time.
Sign #5: Feeling "Hangry" and Moody
That feeling where you go from calm to fully irritated in thirty seconds, and later realize you just hadn't eaten. We've all been there, and it's genuinely unpleasant.
Why it happens: your brain relies heavily on glucose as its primary fuel source. When blood sugar drops, whether from skipping a meal, going too long without eating, or simply not eating enough, it directly affects concentration, mood, decision-making, and your ability to regulate emotions. “Hangry” isn't just a punchline; it's a real, well-documented physiological response.
What to do: learn to catch hunger before it turns into that ravenous, can't-think-straight state. The hunger scale, ranging from 1 (starving, weak, possibly dizzy) to 10 (uncomfortably full), can help. A 5 or 6 is that comfortable, satisfied, energized zone. Aim to start eating around a 3 or 4, rather than waiting until you're down at a 1 or 2, since waiting that long sets you up for the crash, the cravings, and the irritability.
Practically, that means building regular eating opportunities into your day, often three balanced meals with snacks layered in as needed. Keep grab-and-go snacks on hand so you're never caught without options:
Apple and peanut butter: fibre from the apple, fat and protein from the peanut butter.
Greek yogurt with berries and flax: protein from the yogurt, fibre from the berries, fat from the flax
Hummus and veggies: hummus alone offers fibre, protein, and fat, and the veggies add even more fibre.
Edamame: covers all three macros on its own, pair it with whole grain crackers to round it out.
Snacks aren't something you need to earn. Reframe them as tools that support your energy, mood, and overall wellbeing, not a reward you have to unlock.
A Simple Place to Start
That mid-afternoon crash, skin changes like acne, skin tags, or darker velvety patches, out-of-control cravings, irregular cycles, and feeling hangry or moody can all trace back, at least in part, to how blood sugar is behaving throughout the day.
None of these signs mean something is fundamentally wrong with you, and this isn't about fear or restriction. Your body is communicating with you, and once you understand what it's saying, you can respond to it. If a few of these felt familiar, it might be worth taking a closer look at your eating patterns, and if it's persistent or you're noticing several of these together, that's a great conversation to bring to a dietitian or healthcare provider who can help you connect the dots and build a plan that fits your life.
Want Support With Your Blood Sugar and Hormone Health?
Working through this on your own can feel overwhelming, especially when there's so much conflicting information out there.
At Nest & Nurture Health, our team of Registered Dietitians provides personalized, evidence-based support to help you build a plan that actually fits your life.
Book a free consultation to learn more about how we can support you.
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