Intermittent Fasting 16:8: A Kenyan Guide

16 8 intermittent fasting (usually written 16:8) means eating within an eight-hour window each day and fasting for the other sixteen. A common Kenyan pattern is a first meal around 10:30 a.m. to midday, a second between 5 p.m. and 7 p.m., and only sugar-free drinks in between. It is not for everyone. Fasting should be avoided without medical supervision in pregnancy and breastfeeding, type 1 diabetes, anyone taking insulin or sulfonylureas, a history of eating disorders, adolescents, and anyone underweight.

Before anything else in this article, read this. Fasting is not a universal good, and it is not safe for every person. If any of the following applies to you, do not start a 16:8 routine without speaking to a qualified clinician first:

  • Pregnancy or breastfeeding
  • Type 1 diabetes
  • Anyone taking insulin or a sulfonylurea (such as glibenclamide, gliclazide or glipizide) — these can cause dangerously low blood sugar during fasting
  • A history of eating disorders — fasting can be harmful and should be managed with professional support
  • Adolescents and children — growing bodies have different needs
  • Anyone who is underweight
  • Anyone taking prescription medication — some medicines need to be taken with food or at set times

If you are on any medication for blood sugar or blood pressure, the safe sequence is: talk to your clinician first, then adjust. Never the other way around. Fasting can change how your body handles medication, and that is a clinical matter, not a lifestyle one.

With that said, this article explains how a 16:8 pattern is commonly structured, how it fits a Kenyan day, what you drink during the fast, and where the honest limits lie.

Key points

- 16 8 intermittent fasting means eating within an eight-hour window and fasting for the remaining sixteen.

- A common pattern is a first meal around 10:30 a.m. to midday and a second between 5 p.m. and 7 p.m., with only sugar-free drinks in between.

- During the fasting hours, hydration matters: water, black tea, black coffee, green tea and herbal teas work; milk, sugar, honey and lemon do not fit a fast.

- Fasting is not safe for everyone — pregnancy, breastfeeding, type 1 diabetes, insulin or sulfonylurea use, eating disorder history, adolescents and underweight readers should not fast without clinical guidance.

- Speak to a clinician before changing meal timing if you take any medication.

What is 16 8 intermittent fasting?

The 16 8 intermittent fasting pattern splits the day into sixteen hours of fasting and eight hours in which you eat. It is a form of time-restricted eating — a rule about when you eat rather than what. It is not suitable for everyone, and the contraindications in the section above come first.

What 16:8 actually means

The 16 8 intermittent fasting pattern refers to the split: sixteen hours of fasting, eight hours in which you eat. It is a form of time-restricted eating rather than a rule about what you eat. Within the eating window, you still make food choices; the routine simply compresses when you eat.

A 16:8 day might look like this:

| Period | What happens | |---|---| | 7 p.m. – 10:30 a.m. | Fasting hours (about 15.5 hours) — sugar-free drinks only | | 10:30 a.m. – 12 p.m. | First meal | | 12 p.m. – 5 p.m. | Fasting hours — hydration only, no snacking | | 5 p.m. – 7 p.m. | Second meal | | 7 p.m. onwards | Fasting begins again |

Notice that the "fast" includes overnight sleep, which is why sixteen hours is less daunting than it sounds. If you finish eating at 7 p.m. and sleep from 10 p.m. to 5 a.m., roughly half the fast is spent asleep.

How the body responds

The idea behind time-restricted eating is that it gives the body extended periods without incoming food, allowing insulin levels to fall between meals and the body to draw on stored fuel. This relates to the glucagon-insulin balance we describe in our article on insulin and glucagon: when insulin is lower, the body can release and use stored glucose.

There is genuine research interest in time-restricted eating, and some studies suggest benefits for some people in some measures. The evidence is also mixed, and it is thinner for long-term outcomes and for African populations specifically. This article does not claim that 16:8 treats, cures or prevents any condition. It presents it as one option some people choose, with real contraindications, under clinical guidance where relevant.

A 16 8 intermittent fasting routine also connects to the dawn phenomenon. Many people find they are not hungry in the morning anyway, because the body has been releasing stored glucose since about 3 a.m. A 16:8 pattern often feels natural to such people, rather than forced. We explain the mechanism in our article on the dawn phenomenon.

A Kenyan 16:8 day

The routine has to fit real Kenyan life, not an idealised one. Here is how it can work in practice.

The morning. You wake, hydrate with water. If you want tea or coffee, it must be black — no milk, no sugar, no honey. This is the part most Kenyans find hardest, because the default cup of tea here comes with milk and two sugars. Switching to black tea or black coffee is the single biggest adjustment. Read our article on what to drink when you cut sugar for more on this.

The commute. A matatu or boda ride to work, usually between 7 a.m. and 9 a.m. No food. Water if you can. This is simply the fasting period continuing.

The first meal, around 10:30 a.m. to midday. This is where the day's eating begins. The idea is a meal built around protein and vegetables, with starch as a smaller part — not a plate dominated by ugali or rice. Think eggs, or meat or fish, with sukuma wiki and a modest portion of starch if you include it at all.

The afternoon. No snacking. Hydration only. This is the part that surprises people: the fasting window is not just the morning. Between the two meals, you keep hydrating and do not graze. We cover why snacking undoes the fast in a separate article.

The second meal, between 5 p.m. and 7 p.m. A second proper meal, ideally finished by 7 p.m. so the sixteen-hour fast can run overnight.

The evening and night. Hydration. No food. The fast resumes and runs through sleep.

What you can drink during the fast

This is where many people accidentally break the fast without realising it. During the fasting hours, the aim is to consume nothing that raises insulin or provides calories.

| Fits the fast | Breaks the fast | |---|---| | Water | Tea with milk | | Water with a pinch of salt | Tea or coffee with sugar | | Black tea (no milk, no sugar) | Sweetened drinks and soda | | Black coffee | Fruit juice | | Green tea | Lemon water with honey | | Hibiscus, chamomile and herbal teas | Milk, including in tea | | Plain sparkling water | Energy drinks |

The rule of thumb: if it has calories or sweetness, it is not fasting. Lemon water with no honey is a grey area — plain water is a cleaner choice, and our article on lemon water and belly fat explains why adding lemon is not the metabolic free pass it is often presented as.

One product note, in the right place. For the hydration part of a fasting routine, some households use an alkaline mineral water system. Dynapharm's MINERAL POT is marketed for preparing drinking water and is described as suitable for use before meals or on an empty stomach. It is a water-preparation product, not a fasting aid or a treatment, and it is mentioned here only because hydration is a genuine part of a fasting routine. Nothing about it is required to fast, and no health claim is made about it.

Making it work in a Kenyan household

A few practical realities matter more than theory.

  1. The family eats at different times. In many homes, children and other family members eat breakfast and dinner at the traditional times. Fasting adults need to manage this without making meals a source of conflict. Eating a second meal with the family at 6 p.m. often fits naturally.
  2. Social pressure is real. Office tea breaks, chai ya jioni and weekend gatherings all revolve around food. Deciding in advance how you will handle these keeps you from making it up in the moment.
  3. The economic angle matters. Kenyan households are under real cost pressure — the price of a 2 kg packet of unga is a live conversation in most homes. Some people find a 16:8 pattern reduces spending on breakfast and snacks. That is a side effect, not a reason to fast if it is unsafe for you.
  4. Do not stack too many changes at once. If you are simultaneously cutting sugar, changing your plate and starting a fasting window, it is easy to fail at all three. Pick a starting point.
  5. Choose a window you can keep. A window that ignores your work schedule will not survive the first hard week.

When to stop

Stop fasting, eat, and seek medical advice if you experience:

  • Dizziness, confusion, shakiness or unusual sweating
  • A pounding heart, or feeling faint
  • Severe headache or persistent nausea
  • Signs of low blood sugar, especially if you take medication
  • Any symptom that feels alarming to you

Fasting should not feel dangerous. If it does, it is not the right tool for you at this time. And if you take medication for blood sugar or blood pressure, this is exactly the kind of situation where a clinician's input is essential before, not after.

Joseph and Mary's story. Joseph, a Nairobi accountant, tried 16:8 after reading about it online. He did not mention it to his clinician, who had him on medication for blood sugar. He struggled with dizziness by mid-morning and nearly fainted on a matatu. When he finally raised it at his next appointment, his clinician adjusted his plan and explained that his medication needed to be considered alongside any change in meal timing. Joseph's mistake was the order of operations: he changed his eating pattern before involving the professional. The fasting itself was not necessarily wrong. Doing it on top of his existing prescription, without guidance, was. Always the other way round.

Frequently asked questions

What is 16 8 intermittent fasting?

It is a pattern of eating in which you consume all your food within an eight-hour window each day and fast for the remaining sixteen — hence "16 8." For example, eating between 10:30 a.m. and 6:30 p.m. The fast includes your sleeping hours, which is why it is less demanding than it sounds.

Who should not do 16:8 fasting?

People who should not fast without clinical guidance include: anyone pregnant or breastfeeding, anyone with type 1 diabetes, anyone taking insulin or a sulfonylurea, anyone with a history of eating disorders, adolescents and children, and anyone underweight. If you take any prescription medication, speak to your clinician first.

What can I drink during the fast?

Water, water with a pinch of salt, black tea, black coffee, green tea and herbal teas all fit a fast. Anything with calories or sweetness does not — so tea with milk, tea with sugar, juice, soda, milk and sweetened drinks all break it.

Can I drink tea with milk while fasting?

No. Milk contains calories and lactose, so tea with milk breaks the fast in the strict sense. Black tea or black coffee works. This is the hardest adjustment for many Kenyan readers, because milky sweet tea is the default.

Is 16 8 intermittent fasting safe if I take diabetes medication?

Not without clinical guidance. Insulin and sulfonylureas in particular can cause low blood sugar when you fast, which can be dangerous. Speak to your clinician before changing your meal timing, and never adjust your medication to fit a fasting routine on your own.

Can I do 16:8 if I am pregnant or breastfeeding?

No. Pregnancy and breastfeeding are periods of higher nutritional need, and fasting is not appropriate without specialist supervision. This is one of the clear contraindications, not a grey area.

How long before I see any benefit?

Results vary, and there is no guaranteed timeline. Much of the early change people notice is simply a shift in eating habits and reduced snacking. Long-term evidence is mixed and not well studied in African populations. If your goal is a specific health outcome, discuss it with a qualified professional rather than relying on a fasting routine alone.

Also read

This article is general information, not medical advice. It is not a substitute for diagnosis or treatment by a qualified health professional. If you have a diagnosed condition or take prescription medication, speak to your clinician before changing your diet, fasting routine or medication.