It’s Official! Laughter Lowers Blood Sugar Levels!

If you have type 2 diabetes or have been told you are at risk of developing it, you will know that managing blood sugar takes daily attention. Most of the focus is rightly on food, exercise, and medication. But research has uncovered an unexpected ally: a good laugh. Studies show that genuine laughter measurably lowers blood glucose after a meal, suggesting that humour and joy may have a real role to play in diabetes management for adults over 50.

This article looks at the surprising science of laughter and blood sugar, what it means for over-50s with diabetes or pre-diabetes, and practical ways to bring more laughter into your daily routine.

The University of Tsukuba Study: Laughter Versus Lectures

The most cited evidence on laughter and blood glucose comes from a study led by Dr Keiko Hayashi at the University of Tsukuba in Japan, published in the journal Diabetes Care. The team recruited people with type 2 diabetes and people without diabetes, then tested how their blood sugar responded to two different post-meal experiences.

On day one, every participant ate the same standard meal and then sat through a 40-minute lecture on a deliberately dull topic. Researchers measured blood glucose before the meal and again two hours afterwards. On day two, the same participants ate the same meal, but this time watched a 40-minute live comedy show. Genuine laughter was the only variable that changed.

The result was striking. Blood glucose readings two hours after the meal were significantly lower on the comedy day than on the lecture day – and this was true for diabetic and non-diabetic participants alike. The published paper concluded that “laughter has a positive effect on the neuroendocrine system, which suppresses elevated blood glucose levels”.

How Laughter Affects Blood Sugar

Researchers think several mechanisms work together to explain the effect:

• Muscle activity. Hearty laughter engages the diaphragm, abdominal muscles, and shoulders. This active muscle work uses up glucose in the bloodstream, much like a short burst of light exercise.
• Stress hormone reduction. Laughter lowers cortisol and adrenaline. Both of these hormones drive up blood sugar, so reducing them helps glucose levels settle.
• Improved insulin response. Some studies suggest laughter improves how cells respond to insulin, helping move glucose out of the blood and into tissues where it can be used.
• Better digestion and circulation. Laughter increases blood flow and supports the parasympathetic nervous system, which governs rest, digestion, and recovery after meals.

Crucially, the Tsukuba team found that the more often people laughed, the better their blood glucose stabilisation became over time. So this is not a one-off curiosity – frequent laughter appears to have a cumulative benefit.

What This Means for Adults Over 50 With Diabetes

For people over 50 living with type 2 diabetes, blood sugar control gets harder with age. Insulin resistance tends to increase, muscle mass naturally decreases, and the cardiovascular complications of diabetes become more pressing. Anything that supports glucose control without side effects is worth taking seriously.

Laughter is free, has no side effects, costs nothing, and combines well with every other strategy your GP or diabetes nurse will suggest. It will not replace metformin, insulin, healthy eating, or regular activity – but it can complement them. Diabetes UK highlights emotional wellbeing as a recognised pillar of good diabetes management, alongside diet and exercise.

Laughter is also valuable for people with pre-diabetes – those whose blood sugar is higher than normal but not yet in the diabetic range. Lifestyle changes at this stage can prevent or delay full type 2 diabetes, and laughter is a low-effort addition to the toolkit.

How Much Laughter Do You Need?

There is no formal “prescription” for laughter, but the Tsukuba research suggests that even a single 40-minute episode of genuine laughter has a measurable effect on post-meal glucose. The benefit grows with frequency. A few practical guidelines that fit the evidence:

• Aim for daily laughter. Even a few short bouts of genuine, hearty laughter each day add up.
• Hearty beats polite. The kind of laughter that engages your whole body has a stronger effect than a quiet chuckle.
• Pair with meals where possible. If you can build laughter into a relaxed mealtime – watching something funny, sharing stories with family – you may help blunt the post-meal blood sugar spike.
• Track your readings. If you use a home glucose monitor, compare typical post-meal numbers with readings after a particularly cheerful meal. The difference is often visible.

Bringing More Laughter Into Your Day

Real, hearty laughter is hard to fake on demand – but you can stack the odds in your favour:

• Make a comedy plan. Set aside time to watch a favourite comedy series, sitcom, stand-up performance, or feel-good film. Variety helps – what was hilarious five years ago may not land the same way today.
• Spend time with funny people. Some friends, family members, or grandchildren simply make you laugh. Plan time with them deliberately rather than waiting for it to happen.
• Try a laughter yoga class. Many community centres and leisure facilities now offer laughter yoga, which uses guided breathing and group exercises to trigger genuine laughter without needing jokes. It works particularly well for people who feel they have lost the laughter habit.
• Read or share humour. Cartoons, light memoirs, and humorous columns can prompt laughs throughout the day.
• Play with grandchildren or pets. Both reliably produce real laughter, and combine the blood sugar benefit with the wellbeing boost of social connection.

For a wider look at why laughter is so good for over-50s health – including its effects on heart health, immunity, pain, and stress – see our guide to the health benefits of laughter.

Combining Laughter With Other Blood Sugar Strategies

Laughter works best as part of a broader approach to blood sugar control. Pair it with the proven essentials:

• Balanced meals with plenty of vegetables, lean protein, and slow-release carbohydrates. NHS guidance on food and diabetes sets out portion-friendly principles.
• Regular activity – even a 10-minute walk after meals helps lower blood glucose.
• Medication taken as prescribed. Never stop or alter diabetes medication without speaking to your GP first.
• Stress management through hobbies, meditation, gentle exercise, and good sleep. Our guide to lowering blood pressure naturally covers stress-reduction techniques that also help blood sugar control, since the two often go hand in hand.
• Routine check-ups with your GP or diabetes nurse so any changes are caught early.

For the wider picture of how lifestyle choices add up over the years, our healthy living guide for longer lives brings together the evidence on diet, movement, sleep, and social connection.