If you’re over 60 and your doctor has told you your blood sugar is “normal,” that word is doing a lot of heavy lifting — and it may not mean what you think it means. “Normal” on a blood test is a line drawn to diagnose diabetes; it was never meant to tell you your level is optimal or exactly where you want to be. Here’s what the landmark trials actually show, and why the right target depends heavily on whether you take diabetes medication. (Based on the insights of Dr. Alex Wibberly）
Key Takeaways
- “Normal” blood sugar is a diagnostic threshold, not necessarily an optimal target — risk rises continuously even within the normal range, per the EPIC-Norfolk study.
- Higher-normal glucose has been linked to increased dementia risk in older adults without diabetes, per a New England Journal of Medicine study.
- The landmark ACCORD trial found aggressively lowering blood sugar with medication in older adults increased mortality by 22%, due to dangerous low blood sugar episodes.
- A low number reached through diet and exercise is fundamentally different from a low number forced down by medication — the target should differ based on which applies to you.
- If you’re on diabetes medication, never chase a lower number on your own — your doctor’s target is deliberately set to keep you safe.
“Normal” Is a Threshold, Not a Target
When blood sugar is measured, doctors typically check fasting glucose or HbA1c (your average level over the past 3 months). The cutoffs used to label results as normal, prediabetic, or diabetic are useful for diagnosis, but the actual harm from glucose doesn’t respect those lines — the relationship is continuous, meaning risk creeps up as your average level rises, even while still technically inside the “normal” range.
A large UK study called the EPIC-Norfolk trial followed thousands of middle-aged and older people and found a steady rise in deaths from all causes, and particularly from heart disease, as HbA1c increased — a rise that was already visible within the normal range. Being told you’re “normal” is reassuring, but it isn’t the same as being told you’re fully in the clear.
The Link to Brain Health
A study published in the New England Journal of Medicine followed older adults without diabetes and tracked their glucose over several years. Even in this group, those with higher average glucose had a higher risk of developing dementia — and the difference showed up at levels most doctors would call normal. Roughly speaking, an average glucose around 115 mg/dL (US) was linked to noticeably higher dementia risk than an average around 100 mg/dL, and neither would earn a diabetes diagnosis. This was observational data, so it can’t prove glucose itself caused the dementia, but it lines up with the understanding that higher-than-optimal sugar gradually damages small blood vessels in the brain.
Why This Matters More After 60
As we age, muscles and other tissues become more resistant to insulin, so the body has to work harder to keep blood sugar in check, while the insulin-producing cells in the pancreas gradually lose some of their reserve. The result is that many people drift slowly into the high-normal and prediabetic range after 60 without ever feeling it. At the same time, older blood vessels and an older brain are more vulnerable to the damage raised glucose causes through glycation — where sugar sticks to proteins, forming advanced glycation end products that drive inflammation and arterial stiffening. The same glucose level that might be fairly harmless at 30 can do more harm at 65.
The Critical Twist: Medication Changes Everything
It would be easy to conclude that everyone over 60 should aim to get their glucose as low as possible — but for people on diabetes medication, this can actually be dangerous. This is best illustrated by one of the most important diabetes trials ever run: the ACCORD trial.
Researchers followed more than 10,000 people with type 2 diabetes at fairly high cardiovascular risk, average age in the early 60s, and split them into two groups. One group aimed for a near-normal HbA1c below 6% using whatever combination of medication it took; the other aimed for a more relaxed target of 7–7.9%. The expectation was that the intensively treated group would do better. Instead, the trial was stopped early because that group had a 22% higher risk of dying — driven largely by low blood sugar episodes from aggressive multi-drug treatment, which in older people can trigger falls, heart rhythm problems, and even bleeding on the brain from a fall. This is why modern guidelines deliberately set more relaxed targets (often 7–8.5% HbA1c) for older adults on medication, and why doctors increasingly try to reduce medication rather than add more.
Reconciling the Two Findings
Higher blood sugar is linked to earlier death, but the group in ACCORD that achieved lower blood sugar also died more often — how do both hold true? The answer: a low number reached naturally is not the same as a low number forced down with medication. When blood sugar is low because of diet, movement, and less abdominal fat, that reflects a healthy, well-functioning system. When it’s low because multiple drugs are dragging it down past where the body wants to sit, the benefit of the low number gets canceled out, and then some, by the risk of dropping too far. The number on the page can look identical while representing something completely different underneath.
If You’re NOT on Diabetes Medication
The encouraging news: the levers that lower blood sugar safely are entirely within your control, and none of them carry meaningful risk of dropping too low (barring severe calorie restriction, which most people aren’t doing).
- What’s on your plate is the biggest lever — getting carbohydrates mostly from whole, intact foods (vegetables, beans, lentils, whole grains) that absorb slowly, while cutting back on refined carbohydrates in ultra-processed foods.
- Muscle matters because it’s the main place spare glucose gets stored and burned. A short walk after meals blunts the blood sugar rise, and regular resistance training builds the muscle capacity to soak up glucose in the first place.
- Sleep matters too — even a few bad nights makes cells more insulin resistant.
- Losing some weight around the middle improves the entire picture.
If you’re not on diabetes medication, the target worth aiming for is a fasting glucose in the low 100s (ideally under about 100 mg/dL) and an HbA1c comfortably below the prediabetic range (under about 5.7%). Generally, for this group, lower is better — as long as it’s your own body keeping it there through lifestyle, not medication.
If You ARE on Diabetes Medication
Your real number is the one your doctor has set for you, which is often deliberately higher to keep you safe from dropping too low. Work with your care team, never chase a lower number on your own, and flag any episodes of feeling shaky, sweaty, or confused, since those can be signs your treatment is pushing your levels down too far. The broader goal for many people on medication is to build the lifestyle habits above alongside treatment, so that over time — with monitoring and medical guidance — medication may eventually be reduced or, in some cases, discontinued entirely under supervision.
Frequently Asked Questions
If my blood sugar is “normal,” do I still need to worry about it?
It’s worth paying attention to, especially after 60. Research shows health risk rises continuously with glucose level, even within the range doctors consider normal — “normal” means you don’t meet the diagnostic criteria for diabetes, not that your level is necessarily optimal.
Should everyone over 60 try to get their blood sugar as low as possible?
No — this depends entirely on whether you’re on diabetes medication. For people not on medication, lower is generally better when achieved through diet and lifestyle. For people on medication, aggressively chasing a lower number can be dangerous, as shown in the ACCORD trial.
Why would lowering blood sugar with medication be riskier than lowering it naturally?
A low number from diet and movement reflects a healthy, well-functioning system. A low number forced down by multiple medications can push blood sugar too far, risking dangerous low blood sugar episodes that can cause falls, heart rhythm problems, and other serious complications, especially in older adults.
What should I do if I feel shaky or sweaty on my diabetes medication?
Flag it to your doctor — these can be signs your treatment is pushing your blood sugar down too far. Never adjust your medication or target on your own; work with your care team.
Quick Start Checklist
- ☐ Confirm with your doctor whether your personal target differs because you’re on medication
- ☐ If not on medication: prioritize whole, intact carbohydrate sources over refined/processed ones
- ☐ Take a short walk after meals to blunt blood sugar spikes
- ☐ Add regular resistance training to build glucose-storing muscle
- ☐ Prioritize consistent, quality sleep
- ☐ If on medication, never chase a lower number without your doctor’s guidance
Source: Dr. Alex Wibberly
Disclaimer: This article is for educational purposes only and is not personal medical advice. If you take insulin or other diabetes medications, never adjust your target or medication based on this article — work with your own doctor, who knows your full medical history. If you experience shakiness, sweating, confusion, or other signs of low blood sugar, contact your doctor promptly.