Keto & fasting 3 – Introduction to meal spacing and fasting

Deb August 5, 2018

More on what I learnt about health, weight loss and longevity in the Real Skinny on Fat online summit. I’m aiming to summarise 30+ hours of videos and many pages of notes into a series of posts that are simple to understand.

  • Post 1 was about how we were made to fear dietary fat, why we don’t need to, and why that was disastrous.
  • Post 2 was about metabolic flexibility and how that ties in with ancestral eating (whatever that means to you).
  • Today I want to talk about the importance of not eating continually, and how we can benefit from even a short break in eating.


The original plan was to cover all the different types of fasting today, but it soon became clear that was going to be way too much – so we’ll just start with the easiest first step

Time Restricted Eating

Sometimes this is referred to as Intermittent Fasting (IF) but that is really something a little different that we’ll talk about later. Time Restricted Feeding (TRF) is more accurate, though I don’t like the term. I just say Meal Spacing, and I’ve also heard it called Eating Window.

If you see a reference to, say, 18/6 TRF, that means 18 hours fasting, 6 hours eating. But we’re going to start a bit easier by talking about 12/12 – fasting overnight for 12 hours, then eating within a 12 hour window,

Think for a moment about the word Breakfast – it doesn’t mean a meal you have to eat as soon as you can after getting up, it literally means the meal with which you break your overnight fast. For it to qualify as a true fast, we really need to have refrained from stuffing our face for at least 24-36 hours. So we’re being a bit liberal calling 12 hours a fast, but that’s fine for now.

No judgement here though. I’m as guilty as the next person of eating more food than I need, more often than I need it. I was as brainwashed as everybody else about how we need to eat early in the day to kick-start metabolism.

But in actual fact, it takes at least 8 hours for food to move through the digestive tract, and 12 hours or more for it be fully processed. We might think we’re hungry after 10 hours, but our last meal is still being utilised.

When we eat 4 to 6 small meals a day, we never get out of growth mode, but we’re adults and shouldn’t be growing!

So, even if you’re already healthy, fasting for at least 12 hours overnight will give your digestive system time to complete its work and draw breath before the next onslaught. We will also get out of “growth mode”. At about the 12 hour mark, your body will start looking for more food. We want to teach it to access its own “backup tank” – your body fat – especially if you’re overweight.


The next thing to think about is…

Spacing Meals within the Eating Window

You want to allow each meal to move from your stomach to your small intestine before adding more food. Would you add more dirty washing to the washing machine when it’s almost done? Same principle. It takes at least 3 hours for food to process in the stomach, more if you don’t produce much hydrochloric acid, and eat lots of protein.

Ideally you would eat three meals a day, spaced about 5 hours apart. That might be breakfast at 8am, lunch at 1.30pm and dinner at 7pm. Though if you’re eating a high carb diet and used to having to graze all day, you might need to start with four.

Summarising what we’ve learnt so far

  • In Post 1 the lesson is – don’t be frightened of dietary fat, we need it!
  • In Post 2 the lesson is – our ancestors were metabolically flexible and going for periods of time without food was quite normal
  • In this post, the lesson is – having plenty of space between meals is good for our digestive system, and our waistlines!

How can we apply this?

Let’s work together on three goals. But before I tell you what they are, I want to stress three things.

• We are NOT reducing calories at this stage
• Don’t rush into it – take it slow, step by step
• If you are a diabetic, have another metabolic or chronic illness, or are on medications – get professional help from your doctor, naturopath or nutrition expert


Goal 1 = Fast overnight for 12 hours

Start where you’re at now. If you’re a midnight snacker, stop that first. Then increase the amount of time between dinner and breakfast by 10-30 minutes a day. You can go hungry for an extra 15 minutes. We’ve already established it’s not going to kill you. (Unless you have a metabolic illness, then you already know you need extra care and help.)

If you already fast for 12 hours overnight, go to the next level and head towards 15 hours.

Goal 2 = Only three meals a day

Breakfast, lunch, dinner, and no snacks. Sound simple? Go, you.

But if it’s too difficult, start with 4 meals a day. As we work on goal 3, it will become easier to space your meals a bit better.

Goal 3 = Increase the % of calories of good fats you’re eating

The first thing you’ll need to do is figure out what your current level of protein, fat and carb intake is. If you don’t already have a good idea, sign up with FitDay or a similar calorie counter website and enter your meals for a day. You might be surprised, or even shocked.

To be ketogenic, your ratios need to be something like protein 20%, fat 70%, carbs 10% but we’re not aiming for that right now. Let’s just aim for protein 30%, fat 40%, carbs 30%. Even that might take you a wee while, so don’t panic if you’re way off.

For a summary of good fats to start eating more off, go here.

Where are you at right now?

If you want to make some changes, think about three things:

  • How long do you fast overnight right now?
  • How many times a day do you eat (and be honest with yourself)?
  • What is your current protein / fat / carb ratio?

I’ll start the ball rolling:

  • Usually 12-13 hours
  • I intend to eat three times a day, but in practice I don’t usually stop and eat a proper lunch, so often graze throughout the late afternoon, early evening (so here’s where I need to do the work)
  • I’m currently around protein 30%, fat 40%, carbs 30%

My goal is to be fully ketogenic within a couple of months, and do my third water fast later that month.

Another member of the household:

  • Usually 10-11 hours (so this could be extended a bit)
  • He’s a bit better at eating lunch than me, but sometimes needs a late afternoon snack. Though, since he implemented some changes that I’ll talk about in the next post, that has already radically changed. Yesterday he had breakfast, an early dinner and a very small supper.
  • Since those changes, he’s currently around protein 25%, fat 50%, carbs 25%

His goal is to be fully ketogenic as soon as possible, maybe within a couple of weeks, and stay there for three weeks. Then he will review and decide what level of keto diet is his best maintenance level.

The remarkable thing about his progress so far is that he isn’t usually a very good fat burner. Tune in next time to see how we’re changing that.

Originally posted on Steemit, where you get paid to blog: https://steemit.com/health/@kiwideb/keto-and-fasting-3-introduction-to-meal-spacing-and-fasting

Top image from the summit website, others from Pixabay.