This past weekend I decided to try an impromptu experiment. I know intermittent fasting has a wide range of health benefits, but how would a reasonably extended fast affect me? Unfortunately, I didn’t have the ability to go get blood work or anything done beforehand or afterward, so this was more of an unofficial personal experiment. Regardless, it was an interesting experience.
I originally set out to go for an entire weekend consuming nothing but water and, in the morning, coffee. My plan was to have one last large meal on Friday night at 7 p.m. and then not eat again until Monday at 7 p.m. for a total of 72 hours without food. In reality, for reasons I’ll explain a little further down, I only continued the fast until Sunday at 7 p.m. for a total of 48 hours. In the interest of doing what I could to combat any potential muscle loss, I did extra workouts on both days including strength training and high intensity interval training.
So, for 48 hours (Friday 7 p.m. to Sunday 7 p.m.) I consumed absolutely nothing but water and coffee and performed moderately taxing bodyweight and barbell strength training workouts and high intensity interval sprints.
Overall, it was a really interesting experience. I noticed some very basic changes in body composition, but the best parts for me were the miscellaneous effects I noticed and the benefit of the experience. Let’s look at some of those effects.
If I had a reliable way to do it I would have measured bodyfat percentage as well but unfortunately I couldn’t, so I was left tracking weight. The first day showed the most dramatic change – a loss of 1.5 kg or 3.3 pounds. The second day of fasting resulted in another smaller loss of 0.6 kg or 1.3 pounds.
After the fasting was over, I continued to track my bodyweight to determine if the changes would last or if the next few days of eating would put me right back where I was. The first day of eating showed an increase of 1 kg or 2.2 pounds. The next two days of eating, however showed subsequent reductions of 0.4 kg (0.88 pounds) and 0.2 kg (0.44 pounds). That brought the overall total to a net loss of 1.7 kg or 3.74 pounds of bodyweight.
Being an informal experiment I didn’t take extensive measurements, only waist circumference. The first day of fasting showed a reduction of 1.5 inches. The second day of fasting resulted in a reduction of 0.5 inches, corresponding to the smaller drop in bodyweight. After the third day of eating, my waist circumference had increased by 0.75 inches. That makes the net total of 1.25 inches (-3.17 cm) lost around my waist.
There were a handful of things I found interesting about the experiment that didn’t really fall into any specific categories.
- Reduction in Body Temperature – Part way into the end of the first day of fasting and all through the second day I found it extremely difficult to maintain body temperature. My wife, in the same room wearing clothing with comparable amounts of insulation, would be perfectly comfortable while I would be teeth-chatteringly freezing. I wound up putting on a jacket and sitting in front of the heater in our office in an attempt to get warm. Conversely, as soon as I broke my fast I became overheated and even started sweating and felt extremely warm after every meal for the next few days until I started feeling normal again.
- Discomfort Plateau – This is the primary reason I decided to end my fast early, the reaching of a discomfort plateau. One of the reasons for attempting this experiment was as a personal test to see how much deprivation and discomfort I could take. I found out though that the hunger of a fast doesn’t increase linearly. Instead, I became extremely hungry by the middle of the first fasting day and then stayed that hungry until I ended my fast. This indicates to me that I could arguably handle any length of food deprivation since the discomfort doesn’t increase past a certain point.
- No Reduction in Performance – During my fast I showed no reduction in performance in any of my exercises and had no trouble adding to the amount I was lifting on both days. Additionally, there was no degradation of my mental faculties. Honestly, I felt like my thinking was even more sharp and focused than normal, although I’m not sure if it actually was or if that was imagined.
- Taste Enhancement – This may be another one that’s just all in my head, but everything I eat now is exponentially more flavorful. I can detect more spices and ingredients in foods and taste more differences in water from various sources. I’ve noticed it seems like it’s slowly going back to normal, so I might be re-acclimating to things. I suppose that’s why they say hunger’s the best spice.
- Comfort with Hunger – Not only have I found I’m much more comfortable being hungry, but I’ve also found that it takes less food on average to satisfy my hunger. I’ve heard people suggest this is the result of my stomach reducing in size in the absence of being stretched out by food, however as far as I can tell that’s just conjecture and I’ve not seen any reliable scientific backing for that claim.
In total it was an interesting experience, though not one I would likely be soon to repeat. The loss of 3.74 pounds and 1.25 inches was a positive benefit, and I didn’t find any downsides to it except for the feeling of hunger itself and the issues with keeping my body temperature up. That being said, I didn’t test any other general health markers or design it to proper experimental rigor and therefore there may have been plenty of ill effects I simply missed.
Would I recommend any to do this? Regularly, probably not. If you absolutely positively need to lose a few pounds or a few inches immediately, this could be an option though it may not be the healthiest long term. I do think the experience itself is worth trying at least once for everyone simply to get exposed to the discomfort of true hunger. Few people who live in wealthy, industrialized nations ever really get to feel what it is to be hungry. I also think it’s a good exercise in willpower and teaching yourself to ignore temptation.
What does everyone else think? Has anyone else tried any extended water fasting? Did you have a similar experience? Share it in the comments!
Photo Credit: Brian Hathcock