Intermittent fasting 101: What is it and will it help me lose weight?

by Liat  - October 15, 2021

In a nutshell, intermittent fasting is just that: fasting intermittently.

It’s limiting calorie intake during certain hours/day or days/week. It’s more of an eating pattern than a diet. It limits when to eat, and not so much what to eat. And that’s part of it’s appeal to people who don’t want to count calories or use their food log to track everything.

Some would say that it’s a more natural way to eat because humans evolved without refrigerators, drive-throughs, or 24-hour convenience stores. We now have access to food (including junk food) all day long, so eating several meals per day plus snacks may be less natural than fasting from time to time.

There are lots of variations on this theme. They include:

  • 16/8 which is 16 hours of fasting, and eating only within the other 8 hours (often 1:00 pm. – 9:00 p.m.);
  • 5:2 days of fasting, where you eat regularly for five days of the week, then take in just 500-600 calories/day for the other two (non-consecutive)

Is intermittent fasting effective for weight loss?

Intermittent fasting can help to lose weight because it can help you to eat fewer calories, and burn more calories too.

Lots of people say they have success with it. But what do the studies say?

According to one review study, intermittent fasting helped people to lose 3-8% of their weight over 3-24 weeks.  In this study, people also lost 4-7% of their waist circumference (i.e., belly fat).

Another study of 100 people with obesity showed that after a year, the people who fasted on alternate days lost more weight than people who didn’t change their eating pattern. But, (and here’s where it’s interesting) they didn’t lose any more weight than those on a calorie restricted diet. Out of the people who were to follow the intermittent fasting protocol, 38% of them dropped out.

Sticking with a diet is one of the keys to weight loss success. So, if you can’t stay with a weight-loss diet, you’re less likely to lose the weight and keep it off.

Before you consider intermittent fasting

Intermittent fasting is not for everyone. People who are underweight, or have eating disorders shouldn’t fast. Neither should women who are pregnant, trying to get pregnant, or are breastfeeding.

Certain medical conditions can be worsened with longer periods of fasting. Also, people taking certain medications can be prone to side effects with intermittent fasting as well.

One of the reasons people drop out of the intermittent fasting eating pattern is that it’s hard to stick with the fasting part. They eat more than the allowed (low-level of) calories when they’re supposed to be fasting. And when they finish fasting, they may overindulge due to the reaction of the appetite hormones and hunger drive while fasting. None of these will help with weight loss.

Also, the hours and days of fasting can be very difficult. So having strong social support will be key to those intermittent periods of fasting. Sticking to a (healthy, nutrient-dense) weight loss diet is the key to success, and intermittent fasting can be difficult for many people to stick with.


Intermittent fasting is a weight loss trend that seems to work for some people. It can help to lose weight and reduce belly fat. But, it isn’t safe for everyone. Many people should not try intermittent fasting because it can be risky. It can also be difficult to stick with.

For the best chance of long-term weight loss success, finding a diet, you can stick with is key.

What about you – Have you or someone you know tried intermittent fasting? What were the results? Let me know in the comments below.

Recipe: Almond Butter Energy Bites

Makes about 12 energy bites

1 cup oats

⅔ cup almond butter

½ cup chocolate chips (semi-sweet and dairy-free if possible)

½ cup flax seeds, ground

2 tbsp honey


Combine all ingredients in a medium bowl and stir.

Using a tablespoon to measure, roll into about 12 energy bites.

Serve & enjoy!

Tip: You can roll the bites to coat them in cocoa powder for a bit of extra flavor and to prevent them from being too sticky.


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Passionate about the science of nutrition and its practical applications, Liat brings a wealth of expertise to unravel the complexities of wellness, providing insightful guidance for your journey to a healthier lifestyle.

  • Hi! I am 5′ 3″ and weighed 138, too much for my petite frame and mostly in my belly, when I began intermittent fasting 2.5 years ago. (2019). This one move transformed my life and put me on a different road for health. Not only did I initially lost several pounds of fat when I first started, it also caused me to be much more mindful of the foods I was eating. With only 8 hours of eating, I began to choose much more wisely, knowing that I needed my daily nutrients in that short time. I’m still doing it (never stopped). I initially experimented and found the 16/8 works best for me. Also, what works best for me is to eat between 10am and 6pm.

    Everyone is different and should consult their doctor. My initial concern was blood sugar. I don’t have diabetes or anything like that, but I was a food grazer. I thought it was a healthy way to eat, and yet my blood sugar would easily drop. So, when I began the fasting, I was surprised to see an immediate positive result – my blood sugar balanced out, and it’s not a problem now unless I don’t eat well, which is very infrequently.

    For me, the constant grazing was causing my blood sugar to go up & down and up & down throughout the day. Now, it’s very controlled during those 8 hours, and I feel fantastic, including during the 16 hours I’m not eating.

    Then…I started seeing Liat earlier this year (2021), began an eating program to add to my intermittent fasting, and I am now at 120 pounds, having lost lots of visceral fat (the “bad” kind) and even lowered my cholesterol without even trying. So…it’s worked for me!

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