Why your genes change your cholesterol plan

You watched a friend turn their cholesterol around. They cut back on cheese and red meat, took it seriously for a couple of months, and their next result came back transformed. So you did the same. You were just as careful, maybe more so. And your number barely moved. It is easy to take that personally, to decide you did it wrong, or that your body is simply stubborn.

Most of the time it is neither. It is that you and your friend are built differently, and some of that difference is written into your genes.

Two people can have the same cholesterol and still need quite different plans, because the body’s handling of fat, of oxidation, and of blood pressure varies from person to person, and a good deal of that variation is inherited. Genes are not your fate here. They are tendencies, a tilt in one direction or another, that tell you where your particular body is likely to need more support. That is the whole idea behind nutrigenomics, the study of how your food and your genes meet.

Let me stay with the client from the first part of this series, the man in his early fifties whose cholesterol we were reading. When we looked at a few of his genetic variants, the picture became much more useful. I will translate each one into plain terms, because the codes themselves are not the point.

The first concerns a gene called APOE, which has a big say in how strongly your blood cholesterol reacts to the fat you eat. He carried the most common version, the one most people have, which behaves in a fairly predictable, middle-of-the-road way.¹ That was genuinely good news. It told us that for him, unlike for people with some of the more reactive versions, careful changes to dietary fat were likely to land in a steady, sensible way rather than swing him around. So we could lean on food with reasonable confidence.

The second was a gene called SOD2, part of the body’s own internal system for mopping up the everyday wear-and-tear damage we call oxidative stress. His version is one that does that job a little less efficiently.² That matters for cholesterol more than it first sounds, because it is largely oxidised, damaged LDL that does harm in the artery wall, not LDL sitting quietly on its own. So for him, supporting his antioxidant defences was not a vague wellness add-on. It was directly relevant to the thing we were trying to protect.

The third, GSTM1, is one of the enzymes the body uses in its glutathione-based clearing system, the housekeeping that helps process and remove all sorts of compounds. Around half of people carry a version of this gene that barely works or is missing altogether, and he was one of them.³ In practice that nudged us toward more of the foods that feed those pathways, particularly the brassicas, the broccoli, rocket and cabbage family, which interact with exactly this system.

There were also genes involved in blood pressure and how the body handles salt, in his case in the ACE and AGT family. I hold those more lightly, because the science linking these particular variants to salt sensitivity is genuinely mixed and still argued over.⁴ They are a gentle prompt to keep an eye on blood pressure and salt, not a hard instruction. Part of working honestly with genetics is knowing which findings are solid and which are still soft.

Put it all together and you can see why a single piece of advice handed to everyone falls short. One person’s strong reactor to dietary fat needs the food side handled tightly. Another, like this client, can lean on food more confidently but needs real attention paid to oxidation and to the clearing pathways. Same headline number, different bodies, different emphasis. The generic plan is not wrong so much as aimed at an average that nobody actually is.

I want to be straight about the limits, because this field gets oversold. Genetics does not hand you a finished protocol, and it certainly does not tell you what will happen. It is one input among several, and a young one at that. It works best read alongside your blood results, your symptoms, your life and what you are actually willing to do. Used that way it stops being a novelty and becomes what it should be, a way to skip some of the guesswork and aim the effort where your body is most likely to feel it.

This is really what I mean when I say we start by understanding the person, not by reaching for a protocol. Your genes are part of that understanding. Not a label, not a worry, just a clearer map of the body you are actually working with.

In the final part, I will show you what we actually did with all of this, and what his numbers did in response.

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