1. Ancient Physiology and Modern Food
Human beings have not changed much in their basic physiology for tens of thousands of years. The body of a modern office worker is, in biological terms, not very different from that of a hunter who tracked game across the savannah. What has changed is the environment in which that body lives and the food that fuels it.
For most of our history, people survived as hunter-gatherers. Their diet was varied but modest, consisting of berries, roots, nuts, leaves, and the occasional success of a hunt or a catch of fish. Food was scarce, so the body evolved to store energy efficiently and to crave rich sources of calories whenever they were available.
With the rise of farming about ten thousand years ago, grain became the staple. Wheat, barley, rice, and maize supplied energy in the form of carbohydrates. This was not a problem in itself, because the daily life of early farmers was extraordinarily demanding. Ploughing fields, carrying water, grinding grain, and harvesting crops consumed vast amounts of energy. In short, the increase in carbohydrates was balanced by the increase in physical labour.
Today the balance has been lost. The modern food industry makes cheap carbohydrates — sugar, white flour, processed starches — available in every supermarket aisle and on every high street. Yet this abundance is relatively recent. For most of human history, people rarely encountered concentrated sugar. The only natural sources were honey and certain fruits, and both were seasonal or difficult to obtain.
From that point onwards, sugar was no longer a luxury but a staple. Industrial processing in the 19th century and mass production in the 20th ensured that sugar found its way into bread, biscuits, sauces, drinks, and almost every packaged food. What had once been rare and seasonal became constant and unavoidable.
At the same time, patterns of work and daily life were changing. Instead of walking for miles, bending to the soil, or carrying heavy loads, people increasingly sat in offices, vehicles, or in front of screens. Machines and automation took over tasks that once consumed human energy. People continued to eat as though they lived in an active world, but their bodies no longer expended that energy. The excess was stored as fat.
The result has been the modern pandemic of obesity, with its familiar consequences: diabetes, heart disease, and high blood pressure. But this is not simply a matter of individual weakness or lack of self-control. The problem lies deeper, in the mismatch between ancient physiology and modern abundance. Our bodies are still programmed to seize carbohydrates and store them for the lean season — a season which never arrives in a world of constant supply. What once ensured survival now works against health.
2. If You Cut Out Sugar and Refined Starches: What Typically Happens
Days 1–7 (adjustment):
- Cravings often intensify at first. This is the body reaching for its usual quick fuel.
- Many people pass more water and feel light-headed or tired for a few days. This is common and usually settles.
- Headaches, irritability, and poor sleep can occur while the body switches fuel sources.
Weeks 2–4 (adaptation):
- Hunger tends to become more stable. Without sharp sugar spikes, many find they can go longer between meals.
- Weight often begins to fall. The first drop includes water; afterwards the body draws more steadily on fat stores.
- Energy feels different: fewer peaks and crashes; some report clearer concentration.
Weeks 4–12 (consolidation):
- Markers that are commonly affected in a positive direction include fasting glucose, waist measurement, triglycerides, and blood pressure.
- Some people see a rise in LDL cholesterol on low-carb patterns; others see improvement overall. Responses vary by individual.
- Exercise shifts: steady walking and gentle cardio feel easier; very intense, sprint-style efforts may feel harder on very low carbohydrate intakes.
How to eat when you remove sugar and refined starches:
- Base meals on non-starchy vegetables, adequate protein (eggs, fish, poultry, meat, tofu), and healthy fats (olive oil, nuts, seeds, avocado).
- If including carbohydrates, keep them unrefined and modest: pulses/beans, oats, whole rye, or small portions of root veg; choose whole fruit over juice.
- Drink water regularly. A pinch of salt with meals can help some people during the first week unless advised otherwise for blood pressure.
3. Medical Caveats
4. Why “Moderation” Fails
Public health campaigns often tell us to eat “all foods in moderation.” On the surface this sounds wise, but in practice it rarely works. The word moderation itself has acquired the tone of moralising — as if health were a matter of virtue and self-denial. People hear it as preaching, and they resist it almost instinctively.
The deeper problem is that moderation collides with both physiology and environment. Our physiology is still tuned to crave sweet and starchy foods because for most of human history they were scarce and valuable. Our environment, by contrast, floods us with them: supermarket shelves stacked high, advertising everywhere, snacks at every counter. To ask for “moderation” in this context is to ask for daily resistance against both biology and marketing.
But resistance is not a sustainable strategy. Willpower is quickly exhausted, and once sugary foods are in the diet the body’s craving cycle is reignited. For many people, trying to eat sugar in moderation is as unrealistic as telling an alcoholic to drink only a little.
A better way forward is not to moralise about moderation but to change the environment and the habit. That means removing refined sugar and ultra-processed carbohydrates altogether, and replacing them with foods that satisfy without triggering craving: vegetables, protein, and healthy fats. The goal is not denial but liberation — freedom from the constant pull of appetite and guilt.
5. Conviction and the Damascene Moment
If moderation sounds like moralising, then perhaps what we really need is something closer to Paul’s Damascene revelation. On the road to Damascus, Paul was not persuaded by argument or gentle advice; he was struck by a sudden, overwhelming awareness that changed the course of his life.
Change in eating habits can sometimes follow a similar pattern. People live for years knowing the risks of sugar, starch, and excess calories. They resist the preaching, they ignore the warnings — until one day, without any apparent trigger, conviction arrives. A diagnosis, a moment in the mirror, or simply an inner awakening can bring about a sudden and radical shift.
This is not a joke but a real human phenomenon. Conviction can arise from apparently nowhere, with surprising force. What was once resisted as moralising becomes embraced as common sense. Moderation fails, but revelation succeeds. The key is not constant exhortation from outside, but a moment of insight that reorders desire from within.
Paul would call that the work of the Spirit; we might call it awareness crystallising into action. Either way, it is the difference between endlessly trying to resist and finally choosing to live differently.
6. Romans 12:1 and the Living Sacrifice
Paul expresses this principle in Romans 12:1:
“I urge you, brothers and sisters, by the mercies of God, to present your bodies as a living sacrifice, holy and acceptable to God — this is your true and proper worship.”
The language of sacrifice reflects the temple world Paul inherited. But the meaning is not ritual slaughter; it is whole-life dedication. The body, with all its actions and choices, is to be offered consciously, not compulsively. Worship becomes not a moment in the temple but the shape of an entire life.
This is where ancient physiology, modern food, and spiritual teaching converge. Our physiology equips us for scarcity, but our world provides abundance. Moderation and preaching fail, but conviction — a reordering of desire — can transform. To present the body as a “living sacrifice” is to match awareness with discipline, to live not in thrall to appetite but in the freedom of balance.
The challenge, then, is not simply to know the problem but to embody the solution. Awareness must lead to practice, and practice must become daily life. In diet as in faith, the call is the same: to live awake, disciplined, and in harmony with what truly sustains life.
