How to lose the most weight in one day?

Written by , Last updated: May 17, 2016

If you're trying to figure out how to lose the most weight in one day, then you'll love to read all about my extreme weight loss challenge.

I will show you exactly what I did to lose almost 20 pounds (9 kilograms) in just 24 hours.

How to lose the most weight in one day (almost 20lbs / 24h)

But before you read any further, you need to know what I did IS EXTREMELY DANGEROUS. Especially if you tried to repeat everything I did.

I know my way around weight loss science, so I did try to stay as safe as possible during my extreme weight loss experiment (you'll see how in a minute).

But no matter how much you know about your body, going through such an intense experience can literally cause your heart to fail. [1]

So don't follow in my footsteps. Just don't.

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How to lose water weight fast over 24 hours?

If you really want to lose the most water weight in a day, you need to have a lot of water in your body to begin with.

So before I even began my extreme weight loss challenge, I tried to gain as much water weight as possible.

I knew that the more water weight I put on before the experiment, the easier it will be for my body to let go of that weight.

So here's exactly what I did before my extreme weight loss experiment:

  • I drank more than double of what I normally drink. I knew that if I my body gets used to getting in more fluids than necessary, it will also give up that water more easily.
  • I ate a lot of watery foods (mostly fruits and vegetables), to provide my body with another source of water for the experiment.
  • I made sure that the energy reserves in my body were full. Some of the energy in our bodies is stored in a form of "glycogen", and this glycogen also binds water to itself. The fuller my glycogen reserves were, the more water my body would hold on to before the experiment.
  • I also ate more salt than usual, because sodium (the main mineral in salt) forces your body to retain even more water. Plus, you lose a lot of sodium while sweating, so stocking up on sodium before my experiment also made sense.
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Now, some people might think I cheated, that I tried to "fake" better weight loss results because I gained a lot of water weight before my challenge.

But the main reason why I did this was to prevent ending up in a severely dehydrated state (where my body would lose too much water). If I ever reached that state, I'd risk serious damage to my health.

To me, no weight loss challenge will never be worth endangering my health, so I made sure I loaded up on as much body water as possible.

Ok, so this is how I put on a lot of water weight before my challenge, now let's take a look at how I actually lost that weight.

Spend a day in a weight loss hell

First, I heated my living room to a nice "working temperature".

30 degrees celsium 87 fahrenheit

Then, I drank down one caffeine pill and 2 pills of Water Out. Both of these act as a diuretic, which means they help you get rid of that water weight faster. Caffeine does one more thing, but we'll get to that later.

I started my 24 hour timer at six o'clock in the afternoon, and I was going to finish exactly 24 hours later.

The room temperature was already high, but I still put on some warm clothes. I could have gone overboard, put on some plastic body wraps, or added 3 more layers of clothes. That would make me sweat even more (and lose weight even faster), but I felt too hot as it was.

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Exercising in an overheated state was stressful enough on its own, so I did it at a slow pace. The entire time I spent on my elliptical trainer, I exercised at the optimal fat-burning pace.

I burned 1200 calories in over two hours on my elliptical trainer. Just like that, I lost 7.7 lbs (3.5 kg) of weight. But that was the easy part.

Wipe out ALL your energy reserves

I kept waking up during the night, because my body was burning up even hours after it had a chance to cool down. In the end, that probably helped speed things up, because by 8 am the next morning, I already lost 10.9 lbs (4.9 kg).

I took another caffeine pill and another 2 pills of Water Out, but this time, I only drank them down with 1 dcl of water. After my living room heated up again, I spend another two hours on my elliptical trainer.

Exercising on the elliptic trainer in intense heat near furnance

I burned off another 1000 calories (2200 in total), but now I was completely out of gas. Our bodies store about 2000-2500 calories of energy (in a form of glycogen), and by 1 pm I completely wiped out those energy reserves.

At this point, my body was forced to rely on nothing my body fat reserves for energy. The problem with our body fat stores is, that the energy from them gets released incredibly slowly. In other words, I couldn't exercise on the elliptic anymore, because even the smallest of efforts would exhaust me completely.

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By 1 pm I lost 15.1 lbs (6.8 kg) in total, but I refused to give up "just" because I had no energy left.

What a difference 24 little weight loss hours make

I drank down another caffeine pill with 1 dcl of water. I knew caffeine speeds up the release of energy from your body fat reserves, and this should give me a temporary energy boost.

And it worked. However, caffeine only got me through another 200 calories (2400 in total), before I was out of energy again.

I still had three hours left, so I pulled the last ace out of my sleeve. I ate about 100 grams of dried dates, because I knew that those 300 calories worth of date-sugar will rush into my blood stream really quickly. And yes, because of those dates, it only took a couple of minutes before I was back on the elliptic (exercising like nothing happened).

Those dates took me through another 400 calories (2800 in total), but I still had had some time left.

I used every mind trick I ever learned to get through those last 200 calories. And in that exhausted state, that final half an hour felt like eternity. I had to lie down on the floor three times, just to regain enough strength to get back on the machine.

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By 6 pm, I burned off 3000 calories, and completed my weight loss experiment 19.5 lbs (8.8 kg) lighter.

But will you actually keep any of that weight off?

When your body loses a ton of water, you have to start drinking slowly. I knew this, but I still went overboard with my drinking (I didn't even realize how thirsty I was before I actually started drinking), so my stomach did hurt for a while.

I also couldn't start drinking "pure" water, but I had to add electrolytes (just a fancy word for minerals like sodium, calcium...) to it. So I added an isotonic powder to the water, to slowly restore the balance of minerals and water in my body.

How much weight did I regain? Well, after I dealt with my thirst, I faced the strongest onset of hunger I felt in years. I did eat more than usually (to make up for the lost 24 hours), but it still took me the next two days, before my cravings returned to normal. Those two days were also enough for almost all of my weight to come back.

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Why would any sane person ever even try this?

There are two reasons why I put myself through such a dangerous weight loss experience.

The first reason was to show you just how fake those promises of "overnight" weight loss results can be. I lost more weight in 24 hours, than some people can lose in a month. But the fact that I regained ALL of it within two days, should tell you that I actually lost very little body fat. Hopefully, because of what you just read, a few less people will be scammed into some dangerous weight loss "quick-fix".

PRO TIP: Go here to learn how to separate between real and fake weight loss results.

The second reason is a bit more uplifting. You see, just a couple of years ago, I was an out-of control overeater. I had a really hard time skipping a single meal, or changing anything about my diet. I also had nowhere near enough willpower to exercise away my crappy diet. Now, I can handle exercising in intense heat, with almost no water for 24 hours.

So this experiment is a sort of a calling card for what I do.

I have set out to help people get rid of their bad eating habits, by showing them how to practice "the art of staying on the wagon". I show them that getting their diets in order does not have to include willpower, self-discipline, or forcing themselves to stay away from forbidden stuff.

What got me through the full 24 hours of my extreme experiment didn't involve any of that "manning up" or "wanting it bad enough" crap. It was more like indifference, acceptance, or a "surrendered" state of mind. And if I, a former binge-eater, can reach this level of self-control, then I honestly believe YOU can learn how to do the same (and reach your own weight loss goals in your own way).

David Brown

Hi, I'm David. This is what I'm best known for:

I'm the guy who took one of the quickest weight loss methods on the planet - water fasting - and used modern science to fine tune it into what could easily be THE FASTEST FAT BURN METHOD IN EXISTENCE.

I have plenty of science to back my bold claim up and PROVE that my PFB Diet can take you beyond the natural fat burn limits of your body WITHOUT destroying any of your muscle mass and vital organ tissue.

If you're an expert working in the fitness industry, you know that it is damn near impossible to reach high fat burn rates without destroying A LOT of your vital body mass in the process. To see how the science behind "The PFB Diet" works, click here.

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