The Myth of Personalised Nutrition: What Are We Really Paying For?

Let’s get real—most “personalised” nutrition plans are not truly personal. They’re built on standard formulas, broad guidelines, and basic assumptions. What’s marketed as custom is often just a well-packaged version of public information.

At the heart of it is basic math: calories in, calories out. Macronutrient splits. A few inputs—age, weight, height, activity level—and out comes a plan. Anyone with a free app or AI tool can generate this in minutes. And to be fair, it’s useful. But let’s not mistake that for true personalisation.

Nutrition, especially for physical health, is not a mystery. It’s measurable, predictable, and built on decades of research. Calories are units of energy—your body needs them to breathe, digest, move, think, repair, and survive. How many? That depends on your body’s structure and lifestyle.

The most common method to calculate this is your Basal Metabolic Rate (BMR)—the number of calories your body burns at rest. For example, the Harris-Benedict Equation is:

For men: BMR = 88.36 + (13.4 × weight in kg) + (4.8 × height in cm) – (5.7 × age in years) For women: BMR = 447.6 + (9.2 × weight in kg) + (3.1 × height in cm) – (4.3 × age in years)

You then multiply your BMR by an activity factor to get your Total Daily Energy Expenditure (TDEE). That’s your estimated daily calorie need.

From there, most plans move on to macronutrients—proteins, carbohydrates, and fats. These are essential for energy, muscle repair, hormone regulation, and cellular function. The ratios vary depending on whether your goal is weight loss, maintenance, or muscle gain—but again, these are standard templates. Slightly tweaked, not truly tailored.

Even the food lists are familiar: lentils, grains, nuts, seeds, eggs, fish, vegetables. These are whole, nutrient-dense foods. Their benefits are widely known. They don’t need to be rediscovered or branded into something “exclusive.”

Micronutrients like magnesium, iron, and zinc support immunity, metabolism, and nerve function. Their roles are established. Their food sources are well-documented. Unless you have a diagnosed deficiency or medical condition, you probably don’t need a supplement box—you need consistent, real food.

Hydration is just as straightforward. The human body is roughly 60% water. Most men need about 3.7 liters per day, women about 2.7 liters. That’s physiology—not a wellness trend.

So what are we actually paying for in these expensive, glossy, “custom” nutrition plans?

Often, we’re paying for structure, packaging, or accountability. What we’re not paying for—despite the marketing—is deep personalisation.

Because here’s what no calculator, no equation, and no AI can compute: your emotions, cravings, memories, identity, or beliefs around food.

Food is not just fuel. It’s comfort, reward, rebellion, culture, nostalgia. You can’t truly personalise a meal plan without understanding the person who’s eating it. Not just their body—but their lived experience. A plan that ignores this might look “accurate” on paper but fail entirely in real life. It might trigger guilt, confusion, or shame. It might convince someone to suppress their cravings, distrust their instincts, or label themselves as “good” or “bad” based on what they ate that day.

And that brings us to a crucial truth: food has no morality.

There is no such thing as “healthy” or “unhealthy” food in absolute terms. These are simplified social labels—not scientific ones. If it’s edible, it contains nutrients. The human body is designed to absorb what it needs and eliminate what it doesn’t.

The only true exception is industrially produced trans fats—chemically altered compounds with no benefit and known harm. Most countries have banned them. Everything else? The body doesn’t judge it. The body processes it.

Nutrition is chemistry. The body is biology.

And nutrition science studies how the two interact—how the body absorbs, uses, stores, and responds to substances in food. Every biological process—energy production, metabolism, mood, cell repair, immune defense, hormonal balance—depends on nutrients. Too little creates deficiency. Too much creates imbalance. The right rhythm creates vitality.

Let’s break that down:

The Six Essential Nutrient Categories

1. Macronutrients (needed in large amounts)

Carbohydrates (4 kcal/g): The body’s main energy source

Proteins (4 kcal/g): Tissue repair, enzymes, immune support

Fats (9 kcal/g): Brain health, hormones, energy reserve

Fiber (0 kcal): Gut function, blood sugar regulation

Water (0 kcal): Hydration, detox, temperature regulation

2. Micronutrients (needed in smaller amounts)

Vitamins: A, B-complex, C, D, E, K—vital for everything from vision and blood to immunity and mood

Minerals: Calcium, iron, zinc, magnesium, potassium, iodine—regulate nerves, oxygen transport, and muscle function

3. Essential Fatty Acids

Omega-3s (ALA, DHA, EPA): Anti-inflammatory, brain and heart support

Omega-6s (Linoleic Acid): Cell structure and skin repair

4. Phytonutrients (plant compounds)

Carotenoids (carrots, tomatoes): Vision, antioxidants

Flavonoids (berries, citrus): Immune and heart health

Polyphenols (coffee, dark chocolate): Brain and metabolic protection

5. Probiotics & Prebiotics

Probiotics (curd, fermented foods): Live microbes for gut health

Prebiotics (fiber in garlic, bananas): Fuel for those microbes

6. Trace Elements

Needed in minute amounts for enzyme and hormone function (e.g., selenium, copper, chromium, iodine)

The Real Personalisation Starts After the Science Ends

Once the chemistry is understood, we must return to the person. Because what we do with food—how we feel about it, when and why we eat, what stories and memories it carries—shapes how that food is received by the body.

Psychology influences cravings, guilt, self-control, and comfort

Philosophy informs values, rituals, and meaning

Physics governs how food becomes motion, how energy flows, and how timing, posture, and nervous system state affect digestion

So while food enters the body as chemical information, how it is processed depends on the full human experience.

That’s where nutrition becomes nourishment—or poison. Not because the food changed. But because the person receiving it did.