Metabolic health in plain words, and how muscle helps

Metabolic health has become one of those phrases that turns up on supplement labels and podcast titles, usually just before someone tries to sell you something. Underneath the marketing it is a plain idea. It describes how well your body handles fuel: how it moves sugar out of the blood after a meal, what it does with fat, and how hard your heart and arteries are working to keep up.

The useful part is that it can be checked with a handful of ordinary measurements, most of them available from your GP practice, one of them from a tape measure in your kitchen drawer. This is general information, not a diagnosis, and it does not replace a proper test. But it helps to know what the numbers mean before someone reads them out to you.

The five usual markers

Doctors generally look at five things together. The cut-offs below are the ones used in a widely cited international definition agreed in 2009 by several heart and diabetes organisations. Your GP may use slightly different figures, and waist thresholds are usually set lower for people of South Asian, Chinese and Japanese heritage.

In the UK the blood sugar test you are offered is often HbA1c rather than a fasting glucose. It reflects your average blood sugar over roughly the previous two to three months, so it is less affected by what you ate yesterday.

A cluster, not a single disease

When someone has three or more of those five markers outside the usual range, doctors call it metabolic syndrome. It is not a disease in itself. It is a pattern that tends to travel together and that raises the risk of type 2 diabetes, heart disease and stroke. Insulin resistance, where the body needs more and more insulin to do the same job, sits near the centre of most explanations of why the markers cluster.

Two things are worth knowing. You can be slim and still have poor markers, particularly if fat is stored deep around the organs. And you can carry more weight than the charts like and have perfectly good numbers. The bathroom scales only tell part of the story, which is one reason NICE now suggests a simple rule of thumb: keep your waist to less than half your height. It is the same argument we made in fitness is not how you look, applied to blood tests.

Why muscle matters so much

Skeletal muscle is the largest single destination for the glucose that enters your blood after a meal. Muscle that is used regularly takes up that glucose more readily, and while muscle is contracting it can pull glucose in through a route that depends less on insulin. Over weeks of training, the body generally becomes more sensitive to insulin. More muscle, used often, gives sugar somewhere useful to go.

Both aerobic exercise and resistance training help, and studies that combine the two tend to show the broadest benefits. The UK physical activity guidelines suggest at least 150 minutes of moderate activity a week, plus muscle-strengthening work on at least two days, and they ask adults to break up long periods of sitting.

Pilates can count towards the strength part if it is genuinely hard work. Reformer sessions on heavier springs, and mat work with added load, ask a lot of the legs, hips and back. Gentle mat classes are an excellent start, but most people benefit from something that progresses towards heavier effort over time. If you train at home, resistance bands for home Pilates are a cheap way to add that load.

Everyday movement matters too. Small studies have found that a short walk after a meal, even 10 to 15 minutes, can blunt the rise in blood sugar that follows. Breaking up long spells at a desk with a few minutes of walking appears to help in a similar way. None of it needs a gym.

Food patterns that help

I am not going to tell you there is one right diet, because the evidence does not say that. What it does say, fairly consistently, is that some patterns look better than others.

Fibre is the place to start. UK guidance is 30 g a day for adults, and most people fall well short. Beans, lentils, chickpeas, oats, barley, whole grains, vegetables, fruit, nuts and seeds are where it lives. Plant-based eating can be a very good fit, with one catch: researchers who have split plant-based diets into healthier and less healthy versions have found that the lower risk of type 2 diabetes goes with whole foods, not with refined grains, sweets and sugary drinks. Chips are vegan. So are fizzy drinks.

A metabolically sensible plant-based day might look like this:

• Breakfast: porridge made with soya milk, topped with soy yoghurt, walnuts and berries. There are more ideas in plant-based breakfasts after a morning class.
• Lunch: a big bowl of lentil and vegetable soup with a slice of rye bread.
• Afternoon: an apple and a handful of almonds, or hummus with carrot sticks.
• Dinner: tofu and broccoli stir-fried with garlic and ginger, over brown rice or barley.

Pulses make all of this cheaper and easier, especially cooked in a batch at the weekend. My guide to cooking beans, lentils and chickpeas from dry covers the timings. Swap butter and coconut oil for olive or rapeseed oil where you can, keep alcohol modest, and make water the default drink.

Getting your numbers checked

In England, adults aged 40 to 74 without certain existing conditions, such as heart disease, diabetes or kidney disease, are invited for a free NHS Health Check every five years, which covers blood pressure, cholesterol and a diabetes risk assessment. Elsewhere in the UK, or outside that age range, ask your GP practice what is available. If you have a family history of type 2 diabetes or heart disease, mention it.

You can measure your waist at home. Find the bottom of your ribs and the top of your hip bones, wrap the tape around midway between them, breathe out normally and read it there. Same time of day, same tape, once a season is plenty.

If you are already on medication for blood pressure, cholesterol or blood sugar, keep taking it unless your doctor says otherwise. Training and better food work alongside treatment, not instead of it.

Quick questions

Can I have metabolic syndrome at a normal weight? Yes. Waist size and blood results matter more than the number on the scales.

Does Pilates count as strength training? It can, if the springs or the load are heavy enough to make the last few repetitions properly hard.

Should I buy a glucose monitor? For people without diabetes there is usually little need. A blood test through your GP is more useful.

How quickly do the numbers change? It varies widely. Blood pressure and blood sugar can respond within a few months of regular training and better eating, while waist size tends to move more slowly.

Put the tape measure back in the kitchen drawer, book the check if you are due one, and go for a walk after dinner tonight.