The Long Game | Dr Alex

A YouTube video claimed magnesium cuts your risk of insulin resistance by 71 percent and lowers your chance of type 2 diabetes by 47 percent over 20 years. Those numbers are real, but look at where they come from. Both figures come from observational studies where nobody was actually given a magnesium supplement. People simply reported what they ate, and the ones eating the most magnesium happened to be eating the most whole food and the most fibre.

When researchers strip out the effect of fibre, the link between magnesium and insulin resistance largely disappears. Magnesium was simply travelling alongside the food that actually mattered.

When magnesium is tested properly, on its own, against a dummy pill, the effect on insulin resistance is small. It barely touches fasting blood sugar, insulin, or your long term marker HbA1c unless it's taken for months or years.

The same video claimed vitamin D dropped diabetes progression from 28 percent down to 3 percent. The large careful trials show a real reduction of around 11 to 12 percent, and often not even large enough to be confident it isn't down to chance.

There's a safety point worth knowing too. The suggested upper limit for supplemental magnesium is 350mg a day. Go above that and it commonly causes diarrhoea, which can leave you dehydrated and flush out other minerals your body needs. The standard blood test for magnesium is close to useless as well, since only around 1 percent of your body's magnesium is actually sitting in your blood.

What genuinely shifted the numbers in proper trials was lifestyle. In the Diabetes Prevention Program, people who changed how they ate, moved, and walked around 150 minutes a week cut their diabetes risk by 58 percent. Metformin, one of the most prescribed diabetes drugs on the planet, only managed 31 percent.

If you already eat real, whole food and move your body regularly, you're almost certainly getting plenty of magnesium from your plate already, and adding a supplement on top is unlikely to make any noticeable difference.

The full list of research references for this video is in the description of the YouTube version.

Disclaimer: This is not personal medical advice and does not override what your doctor says.

#dralex #magnesium #insulinresistance

My father in law Paul is 67 and was up on our roof this week fitting stone tiles that weigh 30 to 40 kilos each. His hands are the size of a dustbin lid and his forearms are wider than his upper arms. He built that body over 50 years of farming and building work, and he explains a study better than any chart could.

Back in 2015 the PURE study followed almost 140,000 people across 17 countries and simply measured how hard they could squeeze a grip device. For every 5 kilos of grip strength a person was missing, their risk of dying from any cause rose by roughly 16 percent, and their risk of dying from heart disease rose by around 17 percent. Grip strength predicted death, including cardiovascular death, more accurately than systolic blood pressure did. Later work in half a million people through the UK Biobank pointed the same way, tying weaker grip to higher rates of heart disease, several cancers and earlier death.

The number on a grip device isn't really the point though. It is just the shadow cast by decades of a body being worked hard and fed well. Muscle behaves like an organ in its own right. It stores the sugar you absorb from food, so a well muscled body keeps blood sugar and insulin lower, while a sedentary body lets sugar linger and slowly stiffen and scar blood vessels. Muscle also releases signalling molecules called myokines that calm inflammation throughout the body. And when you become seriously unwell, muscle is the protein reserve your body draws on to fuel recovery, which is why frailty and low muscle mass predict poor survival across so many illnesses.

None of this is quick. You cannot revise for a grip test the night before and there is no supplement or medication that builds it for you. It comes from lifting heavy things regularly, ideally at least three times a week, and eating enough protein, aiming for around 1.2 grams per kilo of body weight spread across the day, checked with your doctor if you have any kidney concerns. The encouraging part is that this system stays open at any age. Even people in their 80s and 90s can build real strength when they train against resistance and eat enough protein to support it.

Paul doesn't see doctors and doesn't check his blood pressure, but he has spent five decades doing the things that protect him anyway. That is what a strong grip is really reporting on.

The full list of research references for this episode is in the description of the YouTube version.

Disclaimer: This is not personal medical advice and does not override what your doctor says.

#dralex #gripstrength #preventativehealth

High blood pressure causes most strokes and heart attacks, and it does this without you ever feeling it. That is exactly why checking it properly every single week matters so much.

Here is the catch though. The way you actually take the reading changes the number you get. Small things like rushing to the chair, talking while the cuff inflates, resting your arm too low, using the wrong cuff size, crossing your legs, or trusting just one reading can shift your result by enough to change a diagnosis completely.

In this video I go through the seven common mistakes people make when measuring their blood pressure at home or in clinic, why each one actually matters physiologically, and what the research shows about how far each one can shift the number.

The full list of research references I used is in the description of the YouTube version of this video.

Disclaimer: This is not personal medical advice and does not override what your doctor says.

#dralex #bloodpressure #hearthealth