Intermittent fasting with nutritional supervision

Intermittent fasting is not a diet — it is a way of structuring when you eat. You are not necessarily changing what you eat, you are changing when. That makes it easy for some people and hard for others, and genuinely unsuitable for certain groups. This page covers the common patterns and the differences between them, the mistakes that waste the result, and who should not try it without speaking to their physician first.

Intermittent fasting may suit you if

• You already eat late and rarely feel hungry in the morning
• Calorie counting wears you down and you prefer a simpler rule
• Late-night eating is your main problem
• Your day is regular and your meal times are under your control
• You want fewer eating occasions without banning foods

How we apply it properly

We start with a wide window (twelve hours) and narrow it gradually to what suits you — rather than jumping to 16:8 on day one. We also define what goes into the window, because eight hours filled with processed food will not deliver. Weekly follow-up comes with it: headaches, dizziness, broken sleep or bingeing are a signal that the pattern needs adjusting, not that you need to push harder.

How does it work?

Every time you eat, insulin rises. Reducing how often you eat reduces how often that happens and gives the body longer stretches without food. Most people also end up eating fewer calories automatically as the window narrows — not because of anything magical, but because there are fewer opportunities to eat. The benefit comes from both together: the gaps, and the reduction that happens on its own.

Common patterns and how they differ

There is no "best" pattern — there is the one that fits your day and that you can keep. A pattern you abandon after two weeks delivers nothing, however good it looks on paper.

• 12:12 — a twelve-hour eating window. The easiest start, and most people are already close to it
• 14:10 — a middle step, reached by delaying breakfast by two hours
• 16:8 — the best known: eating from noon to eight in the evening, for example
• 5:2 — normal eating on five days with a large reduction on two non-consecutive days
• Alternate-day fasting — the hardest to sustain and not the right fit for most people

Who should not try it without asking their physician

This is the most important section on the page. Intermittent fasting is not safe for everyone, and there are situations where it can genuinely cause harm. If any of the following applies to you, the decision rests with the physician following your case — and the nutrition plan is built around that decision, not around your preference or our opinion.

• Pregnant and breastfeeding women
• Children and adolescents
• People with diabetes taking insulin or glucose-lowering medication — the hypoglycaemia risk is real
• Anyone with a history of disordered eating
• People with chronic kidney or liver conditions
• Anyone on medication whose timing is tied to meals
• Around the period before or after surgery

The five mistakes that waste the result

Most people who say "I tried intermittent fasting and it didn't work" hit one of these. The fix is usually simple.

• An eating window filled with processed food — fasting is not a licence to eat anything
• Jumping to 16:8 on day one instead of building up
• Too little protein, so part of the weight lost is muscle
• Too little water — most fasting headaches come from dehydration, not hunger
• Too little sleep, which raises cravings inside the window and cancels the benefit

What the programme looks like

We start by reviewing your health, your medication and the shape of your day, and decide together whether intermittent fasting is appropriate at all — in many cases the answer is no and we work with a different approach. If it is appropriate, we choose the pattern, build up to it gradually, plan the eating window itself, and follow up weekly.

• An initial assessment: is this pattern appropriate for you at all?
• A gradual build from twelve hours to the right window
• A plan for the eating window — not just the timings
• Weekly follow-up and adjustment if symptoms appear

Common questions about this area

• What can I drink while fasting?

  Water, tea and coffee without sugar or milk. Anything with calories breaks the fast. Water matters particularly because most of the headaches and dizziness in the first days come from dehydration rather than hunger.

• Can I train while fasting?

  Light exercise and walking are fine for most people. Harder sessions or heavy lifting are better placed near the eating window for performance and recovery. If you feel dizzy or unusually drained, stop and ask.

• Will it take weight off faster than other approaches?

  Not necessarily. Its main advantage is that it is easier to stick to for certain people, and that is what makes the difference long term. The fastest approach is the one you can keep, not the one with the biggest number in the first fortnight.

• I fast in Ramadan — is that the same thing?

  Close in principle and different in the detail: fasting in Ramadan excludes water too, and its timing follows sunrise and sunset. People who fast in Ramadan have practical experience that makes intermittent fasting easier, but the nutrition plan differs between the two.

• If I break the fast one day, what should I do?

  Carry on normally the next day. This is measured in weeks, not days, and one day cancels nothing. What cancels the result is abandoning it entirely because of one day.

• I have diabetes — can I try it?

  Not without going back to the physician following your case. If you take insulin or glucose-lowering medication, fasting periods can cause hypoglycaemia, and any change to meal timing has to be matched by your physician reviewing your doses. We handle the nutrition side after that decision.