What is a normal HbA1c in the UK?

UK labs report in mmol/mol. Below 42 is generally considered normal, 42 to 47 is prediabetes, and 48 or above is in the diabetes range. Ask your GP for the number itself rather than accepting 'fine', and ask what it was in previous years.

How quickly can HbA1c come down?

HbA1c reflects roughly the last three months, weighted towards the most recent weeks, so changes show up gradually. A retest at three months is the first honest read. Drops of several mmol/mol over a single 90-day window are common when the eating pattern really changes.

How can I lower HbA1c without medication?

The levers that matter most are reducing sugar and refined carbohydrate, eating fibre and protein before the starchy part of a meal, stopping between-meal grazing, walking after meals, keeping muscle, and sleeping properly. None is dramatic on its own; together they change how much insulin every day demands. Keep your GP involved, especially if you take medication.

Does exercise lower HbA1c?

Yes, and the timing helps. Muscle can take up glucose without much insulin involvement, so a ten to fifteen minute walk after your biggest meal blunts that meal's peak. Resistance work matters too, because more muscle means more places for blood sugar to go.

How to Lower HbA1c Naturally: A UK Guide (mmol/mol)

Mine was well into the diabetes range, on seven medications, for four and a half years. It came down, and stayed down. Here's what the number actually is and what moves it — in plain terms, with no supplement miracle claimed.

What HbA1c measures

Glucose sticks to the haemoglobin in your red blood cells. Those cells live around three months, so measuring how much sugar is stuck to them gives an average of your blood sugar over roughly that period — weighted towards the most recent few weeks. That's why it can't be gamed the week before a blood test, and why the only honest retest is at ninety days.

UK ranges (mmol/mol)

Below 42 — normal
42 to 47 — prediabetes / non-diabetic hyperglycaemia
48 and above — diabetes range

Ask your surgery for the figure, not the verdict, and ask what it was three and five years ago. A "normal" 41 that used to be 34 is a direction of travel, and that's the useful information.

Why it's high in the first place

Almost always insulin resistance: cells responding poorly to insulin, the pancreas making more to compensate, and glucose sitting higher for longer after every meal. Read insulin resistance explained if that's new to you — it's the reason the changes below work and "eat less of the same food" usually doesn't.

The six things that moved mine

Cut the sugar and the refined starch. Not to zero, but genuinely down. Fizzy drinks and fruit juice first, then the white bread, biscuits and cereal habit.
Eat in the right order. Fibre and protein before the potatoes, rice or pasta. Same meal, lower peak.
Stop grazing. Three meals, nothing between. Each snack is another insulin call, and the constant calling is the problem.
Walk after your biggest meal. Ten to fifteen minutes. Muscle pulls glucose out of the blood without needing much insulin.
Keep your muscle. Enough protein and some resistance work. Losing weight by losing muscle makes the number harder to hold.
Sleep. A run of bad nights raises blood sugar on its own and makes everything else harder to stick to.

There's a UK-supermarket version of the food side here: what to eat for insulin resistance.

What to expect at the retest

Don't judge it weekly. Change the pattern, hold it for ninety days, retest. If the number has moved, you have evidence it's working for your body — and that evidence is worth more than any before-and-after photo. If it hasn't moved at all, something in the pattern hasn't actually changed, and it's usually the grazing.

If you're on medication

As the number improves, doses often need reducing — that's a good problem, but not one to manage alone. Insulin and sulfonylureas in particular can take blood sugar too low if the dose stays high while your food changes. Tell your GP or diabetes nurse before you change things.

Where my two drinks fit

I take Unicity Unimate in the morning and the Balance fibre drink before my main meal. They're food supplements, not medicine, and they don't treat diabetes or lower HbA1c by themselves. They make two of the six things above happen automatically for me, every day, which is why I still use them four years on. Plain explanation: the Feel Great system.

I'm not a doctor and this isn't medical advice. Happy to talk it through if you're staring at a letter from your GP — message me.

How to Lower Your HbA1c: A Plain UK Guide