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What Lowers Blood Sugar? Foods, Medicines & Tips

Written by

Bolt Pharmacy

Published

31/10/2026

Last Updated

Overseen by Marie Boes

Clinical oversight Adedayo Titiloye, Deputy Superintendent Pharmacist, GPhC 2072783

Checked against the Bolt Clinical Accuracy Standard, 31 October 2026

What lowers blood sugar is a question relevant to millions of people in the UK, whether managing diabetes, prediabetes, or simply trying to maintain good metabolic health. Blood sugar is regulated through a combination of insulin action, liver function, dietary choices, physical activity, and, where needed, prescribed medicines. This article explains the key mechanisms behind blood sugar control, which foods and lifestyle changes make a genuine difference, which medicines are recommended by NICE and authorised by the MHRA, and when to seek advice from your GP or diabetes team.

Summary: Blood sugar is lowered by insulin action, low-GI foods, regular exercise, and prescribed medicines such as metformin, SGLT-2 inhibitors, and GLP-1 receptor agonists.

Insulin is the primary hormone that lowers blood sugar by enabling cells to absorb glucose from the bloodstream.
Low-GI foods such as legumes, wholegrains, non-starchy vegetables, and berries help prevent sharp post-meal glucose rises.
NICE (NG28) recommends metformin as first-line treatment for type 2 diabetes, with SGLT-2 inhibitors and GLP-1 receptor agonists as key second-line options.
Regular aerobic and resistance exercise improves insulin sensitivity and lowers blood sugar both immediately and over the longer term.
Tirzepatide (Mounjaro) is MHRA-authorised for type 2 diabetes and chronic weight management, acting on both GLP-1 and GIP receptors.
Symptoms such as increased thirst, frequent urination, or fatigue should prompt a GP appointment for fasting glucose or HbA1c testing.

What actually lowers blood sugar, and how does it work?
Which foods and drinks help bring blood sugar down?
How do prescribed medicines lower blood sugar in the UK?
Can exercise and lifestyle changes make a real difference?
When should you speak to your GP about high blood sugar?
Scientific References
Frequently Asked Questions

Method	Mechanism	Examples	Key Considerations
Low-GI diet	Slows glucose absorption from the gut, reducing post-meal glucose spikes	Oats, lentils, non-starchy vegetables, berries, wholegrains	Dietary fibre, especially soluble fibre, is particularly beneficial; follow NHS Eatwell Guide
Physical activity	Increases glucose uptake into muscle cells, independently of insulin; improves insulin sensitivity	Brisk walking, cycling, swimming, resistance training	Effect lasts several hours post-exercise; hypoglycaemia risk if using insulin or sulfonylureas
Weight loss	Reduces insulin resistance; 5 to 10 per cent body weight loss can significantly improve control	Dietary change, structured programmes, medical support	Sustained loss may lead to type 2 diabetes remission; supported by DiRECT trial evidence
Metformin	Reduces hepatic glucose production; improves insulin sensitivity	First-line oral treatment per NICE NG28	Does not cause hypoglycaemia alone; does not cause weight gain
SGLT-2 inhibitors	Cause kidneys to excrete excess glucose in urine	Dapagliflozin, empagliflozin	Additional cardiovascular and renal benefits; recommended by NICE for high-risk patients
GLP-1 receptor agonists and dual agonists	Stimulate glucose-dependent insulin release, slow gastric emptying, reduce appetite	Semaglutide (Ozempic), tirzepatide (Mounjaro, GLP-1 and GIP dual agonist)	MHRA-authorised; also support weight loss; require prescriber assessment
Insulin therapy	Directly replaces or supplements endogenous insulin to facilitate cellular glucose uptake	Various formulations, basal and bolus regimens	Used when other medicines are insufficient; carries hypoglycaemia risk; requires clinical supervision

What actually lowers blood sugar, and how does it work?

Blood sugar is lowered when insulin enables cells to absorb glucose, when the liver reduces glucose output, or when medicines increase renal glucose excretion. Normal fasting blood glucose for adults without diabetes is roughly 4.0 to 5.9 mmol/L, per NHS guidance.

Blood sugar (glucose) is lowered when cells absorb it from the bloodstream, when the liver reduces its glucose output, or when the kidneys excrete excess glucose in urine (the latter occurs when blood glucose exceeds the renal threshold, or pharmacologically with certain medicines). Under normal circumstances, the pancreas releases insulin in response to rising blood glucose, and insulin acts as a key that unlocks cells so they can take up glucose for energy or storage. When this system works efficiently, blood sugar returns to a normal fasting range. For adults without diabetes, NHS guidance indicates a typical fasting blood glucose of roughly 4.0 to 5.9 mmol/L; diagnostic and treatment targets differ for people with diabetes and are set individually.

In people with type 2 diabetes or insulin resistance, cells respond poorly to insulin, so glucose accumulates in the blood. Interventions that lower blood sugar therefore work through several overlapping mechanisms: improving insulin sensitivity, stimulating more insulin release, slowing glucose absorption from the gut, or increasing glucose excretion. Understanding these pathways helps explain why different foods, medicines, and lifestyle changes each have a role to play.

Blood sugar targets are not universal. The right range depends on whether a person has diabetes, what type they have, their age, and any other health conditions. NICE guidelines (NG28 for type 2 diabetes; NG17 for type 1 diabetes) set individualised targets, and these should always be agreed with a clinician rather than self-managed in isolation.^[2]^[3]

Which foods and drinks help bring blood sugar down?

Low-GI foods such as legumes, wholegrains, non-starchy vegetables, and berries slow glucose absorption and support steadier blood sugar levels. Water is the best drink choice; sugary drinks, fruit juices, and alcohol can raise blood sugar rapidly.

No single food dramatically lowers blood sugar in the way a medicine does, but choosing foods with a low glycaemic index (GI) helps prevent sharp rises and supports steadier glucose levels throughout the day. Low-GI foods release glucose more slowly into the bloodstream, reducing the demand on insulin. Diabetes UK provides patient-facing guidance on GI and its practical application. Examples of lower-GI choices include:

Non-starchy vegetables such as broccoli, spinach, courgette and peppers
Legumes including lentils, chickpeas and kidney beans
Wholegrains such as oats, barley and wholegrain bread
Nuts and seeds, which are high in healthy fats and fibre
Berries, which tend to be lower in sugar than many other fruits

Dietary fibre is particularly important because it slows gastric emptying and blunts the post-meal glucose rise. Soluble fibre, found in oats and pulses, is especially relevant. Vinegar-based dressings have been studied for a modest effect on post-meal glucose, but the evidence is not strong enough to recommend them as a treatment. Unsweetened tea and coffee appear broadly neutral or mildly beneficial in observational studies, though the evidence is not conclusive.

Drinks matter too. Water is the best choice for hydration. Sugary drinks, fruit juices and alcohol can all raise blood sugar rapidly and should be limited. Alcohol also carries a risk of delayed hypoglycaemia in people using insulin or sulfonylureas; anyone in this situation should seek personalised advice from their GP or diabetes team, and the NHS provides specific guidance on alcohol and diabetes.^[6]^[7]

The NHS Eatwell Guide provides a practical framework for balanced eating that supports blood sugar management without requiring extreme dietary restriction. For personalised dietary advice, a referral to a registered dietitian is recommended.

How do prescribed medicines lower blood sugar in the UK?

Metformin is the NICE-recommended first-line oral treatment for type 2 diabetes, reducing liver glucose output and improving insulin sensitivity. Second-line options include SGLT-2 inhibitors, GLP-1 receptor agonists, DPP-4 inhibitors, sulfonylureas, and insulin.

Several classes of medicine are authorised by the MHRA and recommended by NICE (NG28) for lowering blood sugar in people with type 2 diabetes, each working through a distinct mechanism. Metformin remains the first-line oral treatment for most people; it reduces glucose production in the liver and improves insulin sensitivity without causing weight gain or hypoglycaemia on its own.

Beyond metformin, NICE recommends a range of second-line options depending on individual circumstances:

SGLT-2 inhibitors (such as dapagliflozin and empagliflozin) cause the kidneys to excrete excess glucose in urine; they also offer cardiovascular and renal benefits, particularly in people with established cardiovascular disease, chronic kidney disease, or at high cardiovascular risk^[2]^[3]
GLP-1 receptor agonists (such as semaglutide, available as Ozempic for type 2 diabetes) stimulate insulin release in a glucose-dependent manner, slow gastric emptying, and reduce appetite^[8]^[5]
DPP-4 inhibitors (such as sitagliptin) enhance the body's own incretin hormones to boost insulin release after meals
Sulfonylureas (such as gliclazide) stimulate the pancreas to produce more insulin, though they carry a risk of hypoglycaemia^[19]^[5]
Insulin therapy is used when other medicines are insufficient, particularly in type 1 diabetes and advanced type 2 diabetes

Tirzepatide (Mounjaro) is authorised by the MHRA both for type 2 diabetes and for chronic weight management. It acts on both GLP-1 and GIP receptors, lowering blood sugar and supporting weight loss. Bolt Pharmacy is a GPhC-registered UK online pharmacy offering online weight-management consultations with prescriber review and pharmacist support; Mounjaro is one option a prescriber may consider after assessment, and is only prescribed where clinically appropriate.

All prescribed medicines should be taken exactly as directed, and any concerns about side effects should be discussed with a GP or pharmacist. Suspected adverse reactions can be reported to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can exercise and lifestyle changes make a real difference?

Regular aerobic and resistance exercise meaningfully lowers blood sugar by increasing glucose uptake into muscle cells, independently of insulin. Modest weight loss of 5 to 10 per cent of body weight can significantly improve blood sugar control and may support type 2 diabetes remission.

Regular physical activity meaningfully lowers blood sugar, both immediately after exercise and over the longer term, by increasing the uptake of glucose into muscle cells independently of insulin. This effect can last for several hours after a session and, with consistent exercise, improves overall insulin sensitivity. Both aerobic exercise (such as brisk walking, cycling or swimming) and resistance training (such as weight-bearing exercises) have demonstrated benefits in clinical studies, in line with the UK Chief Medical Officers' Physical Activity Guidelines.^[14]

For people with a diagnosis of type 2 diabetes, NICE (NG28) recommends structured education programmes such as DESMOND (Diabetes Education and Self Management for Ongoing and Newly Diagnosed) or X-PERT, which combine dietary advice, physical activity support and behaviour change strategies. These programmes have been shown to reduce HbA1c (a measure of average blood sugar over roughly three months) and support weight management. For people at high risk of developing type 2 diabetes (prediabetes), the NHS Diabetes Prevention Programme (NDPP) offers a separate, evidence-based intervention.

People using insulin or sulfonylureas should be aware that exercise can increase the risk of hypoglycaemia. It is important to monitor blood glucose before, during and after activity, to carry fast-acting carbohydrates, and to discuss any changes to exercise habits with a clinician, who can advise on dose or timing adjustments.

Beyond formal exercise, reducing sedentary time makes a measurable difference. Regularly breaking up long periods of sitting with short walks or light movement has been shown to blunt post-meal glucose rises.^[16]^[17] Sleep quality also matters: poor or disrupted sleep raises cortisol and other stress hormones that push blood sugar up, so addressing sleep hygiene is a legitimate part of blood sugar management.

Weight loss, even modest amounts of 5 to 10 per cent of body weight, can significantly improve blood sugar control in people who are overweight.^[24] In some cases, sustained weight loss through dietary change or medical support has led to type 2 diabetes remission, as evidenced by the DiRECT trial (published in The Lancet) and supported by the NHS Type 2 Diabetes Path to Remission Programme.^[20]^[21] These lifestyle changes are most effective when supported by a healthcare team rather than attempted in isolation.

When should you speak to your GP about high blood sugar?

See your GP if you experience persistent thirst, frequent urination, unexplained fatigue, blurred vision, or slow-healing wounds, as these may indicate high blood sugar. Call 999 immediately if symptoms of diabetic ketoacidosis or hyperosmolar hyperglycaemic state develop.

You should speak to your GP if you experience persistent symptoms that may suggest high blood sugar, including increased thirst, frequent urination, unexplained fatigue, blurred vision or slow-healing wounds. These symptoms do not always mean diabetes, but they warrant investigation. Your GP can arrange a fasting blood glucose test or an HbA1c blood test to assess your average glucose levels over the preceding months.

If you already have a diagnosis of diabetes or prediabetes and your blood sugar readings are consistently above your agreed target range despite following your current management plan, this is also a reason to contact your GP. Medication doses may need adjusting, or additional support may be appropriate.

Certain situations require more urgent attention. If you or someone you are with develops symptoms of diabetic ketoacidosis (DKA), which can include rapid breathing, vomiting, abdominal pain and a fruity smell on the breath, call 999 immediately, as this is a medical emergency. People with type 2 diabetes should also be aware of hyperosmolar hyperglycaemic state (HHS), which can develop more gradually and may present with severe dehydration, confusion or drowsiness; this also requires emergency medical attention, so call 999 if these symptoms occur. For urgent advice that does not require an emergency response, NHS 111 is available 24 hours a day.

Routine blood sugar monitoring, annual diabetes reviews and regular HbA1c checks are all part of the structured care that NICE recommends for people with diabetes. If you are concerned about your risk of developing type 2 diabetes, your GP can assess your risk factors and refer you to the NHS Diabetes Prevention Programme if appropriate. Early intervention consistently produces better outcomes than waiting until blood sugar is significantly elevated.

Scientific References

Frequently Asked Questions

What is the fastest way to lower blood sugar safely?

For people with diabetes, prescribed medicines such as insulin or oral glucose-lowering drugs are the most reliable way to reduce elevated blood sugar under medical supervision. Short bouts of physical activity can also lower blood sugar relatively quickly by increasing glucose uptake into muscles.

Can drinking water help lower blood sugar?

Staying well hydrated with water supports kidney function and can help the body excrete excess glucose in urine when blood sugar is elevated. Water is the best drink choice for people managing blood sugar, as sugary drinks and fruit juices can cause rapid glucose rises.

Which medicines does NICE recommend for lowering blood sugar in type 2 diabetes?

NICE (NG28) recommends metformin as the first-line treatment for most people with type 2 diabetes, with second-line options including SGLT-2 inhibitors, GLP-1 receptor agonists, DPP-4 inhibitors, and sulfonylureas depending on individual circumstances. Tirzepatide (Mounjaro) is also MHRA-authorised for type 2 diabetes and chronic weight management.

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