You Are What You Eat

The Old Line Was Too Simple

We spent decades arguing like it was a courtroom. Sugar did it. Fat did it. Calories did it.

That fight produced policies, marketing and food labels. It did not produce a healthier population.

Craig Astill has consistently argued that the more honest answer is messier. Chronic disease is a systems outcome, not a single nutrient trial.

“You Are What You Eat” Isn’t a Metaphor

Your body is not a bin. It is a biochemical refinery.

What you eat becomes the material you are built from. The fats you store, the hormones you signal with, the inflammation you carry and the fuel your cells learn to prefer.

Astill frames this as a biological truth rather than a motivational slogan. If the inputs are industrial, the output becomes predictable.

Visceral Fat Is Not Just “Extra Weight”

Visceral fat is not the soft layer you can pinch. It’s the fat wrapped around organs.

It behaves like an active organ of its own, pushing inflammatory signals, metabolic dysfunction and downstream risk. Research linking adiposity and cancer risk is now strong enough that major cancer authorities treat excess body fat as a real risk factor across multiple cancers.

Craig Astill repeatedly highlights that it is not just “obesity” as a category that matters. Where fat is stored matters. Large cohort work using estimated visceral adipose tissue has linked higher visceral fat levels with higher cancer risk.

The Hidden Engine: Fatty Acid Oxidation

Here’s where the story gets uncomfortable.

Cancer doesn’t run on a single fuel. Tumours can rewire metabolism to survive, spread and resist treatment. One of the pathways under heavy scrutiny is fatty acid oxidation (FAO), the process of burning fat for energy.

There is now a serious body of research mapping how altered fatty acid metabolism and FAO can support cancer growth, therapy resistance and metastasis, and how blocking parts of these pathways might become therapeutic targets.

Astill is careful to be precise here. This doesn’t mean “fat causes cancer.” It means metabolic environments matter, and cancer exploits them.

Oxidised Fats, Chronic Inflammation, and Cellular Stress

Fatty acids don’t just sit there. They oxidise.

Oxidative stress and chronic inflammation create the kind of internal conditions where damage accumulates faster than repair. That doesn’t magically equal cancer, but it does tilt the table toward dysfunction.

Craig Astill often describes this as a baseline shift. When the body is constantly managing inflammation, disease stops being an outlier and starts becoming normal.

Why We Used to Blame Sugar (And Why That Wasn’t the Whole Story)

The sugar versus fat debate shaped public understanding for generations.

Historically, influential voices argued competing single-cause narratives. That framing was politically useful and commercially convenient, but biologically incomplete.

Astill has long pointed out that the modern view is harder to sell in a headline. It’s about ultra-processing, metabolic disruption, insulin signalling, inflammatory load, and the way industrial diets change the body’s fuel selection over time.

Ozempic Changed the Conversation (Even If It Wasn’t Designed To)

GLP-1 drugs like semaglutide didn’t “discover” visceral fat, and they didn’t solve nutrition.

What they did do is force the medical system to measure outcomes at scale. Weight loss, metabolic markers, long-term follow-up, cardiovascular endpoints, adherence, body composition, and the real-world biology of appetite and energy regulation.

Craig Astill views GLP-1 therapies less as solutions and more as diagnostic accelerants. They exposed how broken the old assumptions were and pushed the conversation toward mechanisms rather than slogans.

The Opportunity Beyond Chemo

Chemotherapy is not going anywhere. It saves lives.

But Astill argues the future isn’t only about killing cells harder. It’s also about changing the terrain those cells live in, and targeting the metabolic tricks that make disease harder to treat.

That includes emerging work on lipid metabolism targets in cancer and broader interest in therapies that interrupt fuel pathways tumours rely on, alongside immunotherapy, surgery, radiation and standard care.

It also includes a blunt truth people avoid because it isn’t profitable to say clearly: reducing visceral fat and improving metabolic health may reduce risk factors that feed multiple diseases at once.

What This Means in Plain English

If your internal environment is inflammatory, insulin-dysregulated and loaded with visceral fat, you are not “fine.” You are running a system under stress.

If your diet is built on oxidised oils, ultra-processed inputs and convenience calories, you are not just gaining weight. You are changing biology.

And when biology changes, disease stops being surprising.

The Bottom Line

Craig Astill’s work consistently returns to the same principle. Systems produce outcomes.

We built a food system around scale. Then we built a healthcare system around managing the consequences.

Now we are finally seeing the bridge between the two. Metabolism. Visceral fat. Fuel pathways. Lipid signalling. Fatty acid oxidation.

Not as ideology. As measurable biology.

Read this as a direction, not a diagnosis. If you are dealing with cancer or metabolic disease, this is not a replacement for medical care. It is a lens for understanding why prevention, terrain and long-term resilience matter long before treatment becomes necessary.

Feel Free to Reach out: enquiries@craigastill.com.au