Important note: Please advise your doctor before following any plan. Don’t follow the advice below if you are under 18.
People always ask: “How much weight can you lose in a week?” Well… to answer your question I have good news, awesome news, and bad news.
First onto the good news: YOU CAN LOSE A TON OF WEIGHT IN ONE WEEK
That’s right, you don’t have to be bound to the conventional wisdom of only losing 1 or 2 pounds a week. Extreme weight loss diets can definitely work, but only for a short period of time.
In fact, you can lose up to 15 pounds in one week if you do it correctly.
Now onto the awesome news: ALL THAT WEIGHT YOU LOSE WILL BE WATER AND FAT, NOT MUSCLE
Yup, you read that correctly, if you follow the methods at the end of this post, all the weight you lose during the week will be pure body fat. The conventional statement that losing more than 2 pounds per week leads to muscle, organ, and hair loss is absolute unicorn shit.
How do I know this? Because some awesome scientists from the American College Of Nutrition back in 1999, conducted a study, which tested 2 groups of people for 12 weeks.
One group only did traditional cardio, while the other group only did weight training. Both groups ate 800 calories a day. At the end of the study, both groups lost large amounts of weight, but the one that only did cardio lost large amounts of lean muscle mass, and the one that only did weight training didn’t lose any muscle mass at all.
So there you go, some hard hitting scientific facts that prove that you will not lose muscle during extreme dieting as long as you lift weights.
Note: And if you don’t have a gym membership or if you don’t have access to any weights, then doing a well-designed bodyweight program like Bodyweight Burn is your next best option.
And lastly, the bad news: YOU HAVE TO EAT VERY VERY LOW CALORIES
So yeah…. you have to eat a ridiculously low amount of calories to lose a lot of weight in a week. I’m talking along the lines of 800 calories a day.
The amount that would make any nutritionist hang themselves.
And now, onto the plan, but first, a picture of steaks:

The 2-step plan to lose the maximum amount of weight in a week
Please note that the following plan can be used by both men and woman.
And don’t do this plan if you’re under 18, you’re way too young to be eating such low calories.
I guarantee that if you follow the plan below, you will lose 10-15 pounds(water and fat) in one week:
1) For one week only, eat 800 calories per day.
2) Workout 2-3 times per week with weights. Make sure the weights are heavy and be sure to hit all body parts.
That’s all.
Some notes/tips about the above 2 steps:
- 800 calories is very little food, for any man, woman, or baby walrus. Because of this, I suggest that you only eat 1 meal per day a la Brad Pilon’s Eat Stop Eat. If you eat one 800 calorie meal per day, then you’ll at least feel somewhat satisfied, but if you split that up into 3 or even worse, 6 meals per day, then you’re not going to fare so well on this one week venture. Yes, this means that you will be fasting 24 hours every day for a whole week. Just remember, you will be burning fat, not muscle.
- Whenever possible, eat higher protein and eat foods with high water content such as fruits and soups. Also, drink lots of coffee and green tea, since they both tend to blunt hunger quite well.
- Stick with heavy compound exercises when in the gym. That means no curling and crunching, and if you even step foot on a treadmill, my dumbass radar will go off and I may have to kill you.
- If you can’t lift weights, then your next best option is to do some sort of bodyweight training. You know…exercises like squats, push-ups, lunges, pull-ups, sit-ups, etc..
- This is a mental game more than anything else. When you’re eating very few calories to lose weight faster, your mind starts playing tricks on you. Your stomach is gonna be grumbling more often. And there are gonna be times where you want nothing more than to self-sabotage yourself. Which is why the next point is so important.
- Above all, keep yourself distracted and out of the kitchen. If you’re constantly prancing around the kitchen and thinking about food, you’re going to fail. So keep yourself busy. Read a book, play some video games, take a nap, work on your tan, or shave your pubes. I don’t care. Just do something that doesn’t involve food.
- [EDIT 10/6/2014] I should also add that your protein intake needs to be HIGH. Like really high. In fact, the majority of your calories should probably come from protein, fruits, and veggies if you want this diet to be effective. The protein will help keep you full but more importantly also help maintain muscle.
Remember, this is only for one week
I just wanted remind you all, that this sort of extreme weight loss plan is only a temporary plan.
The results don’t have to be temporary, but the plan is. Please do not try and do this weight loss plan for more than a week.
Doing so is really going to mess with your head and you’ll most likely binge back to your original weight.
After one week, transition to a more moderate weight loss plan for the long haul.
I hope you guys now know how much weight you could lose in a week if went balls to the walls.
Want even better results? Take it to the next level with Fat Loss Boost
Many people have been asking me, “Can I do this for more than 7 days?”
Uh…
Yes and no.
Technically, you could eat 800 cals per day for a sustained period of time.
But sooner or later it’s gonna backfire on you.
If you want a more sustainable rapid fat loss plan…
Then I highly recommend checking out Fat Loss Boost.
This is a more long-term approach than the strategy I outlined in this blog post.
It’s a strategic rapid fat loss diet that works in 14 day cycles.
So you go hard on the diet for 14 days, lose a crap ton of weight, take a break, and repeat.
And the results from Fat Loss Boost are even better:
““I have been able to lose 10 pounds using this program. Starting weight 186. Weight this morning was 176.”
“I lost 12 lbs for my first attempt. Started at 201.7 and ended at 189.9. I am amazed!!! Thanks to everywhere for all the support and great hacks.”
“Ok people I’m done 😀. I hit 171.8 today, my goal was to break 172 on this round which was what I weighed almost ten years ago (lowest as an adult). That’s 30.2 lbs in just under 3 months.“
Pretty crazy, right?
Definitely give it a look if you want a realistic, yet challenging plan that burns fat faster than anything. you ever tried before.
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Questions? Like steak? Let me know down below.
I respond to (almost) every comment, which is pretty crazy considering there’s been over 3000 comments. Sigh…I need a hobby.


Due my work commitments don’t have much access to gym lately .. Which body weight exercises would be the best ??
How much water a day can you drink along with the 800 calories?
as much as you want.
I was wondering if you could tell me how much, in percentage, I should eat should be eating of Carbs, Protein, and Fat within the 800 calories. I use MyFitnessPal, and it will make it easier to just plug in the percentages of each food group I should eat. Also, I am assuming the only Carbs I can have are just Fruit and Veggies Carbs, and the Protein and Fat should come from just meat. Can Cheese be eaten? Can the Sweet Leaf Sweetener be used for Coffee?
I did this for a week and lose 5kg. Just like that. I was so shocked when I hit the scale on a Saturday (started on Mon). I repeat, just like that. No exercise, nothing. Just my daily routine and fasting.
I will have my one awesome meal in the evening around 8ish. Trust me, you can never eat as much as you want or could when you are having 3 normal meals a day.
In the day, I will have two coffee (9am and 3om) and loads of H2O to sustain me and let the adrenaline pump me.
nice job.
Hi folks.
I am 26, about 76kg and just under 5′ 4″. Was just wondering what could I expect to lose?
I would be a regular gym guy doing mostly weights but have slipped off the wagon after a car accident a couple of months ago.
What kind of sessions should I be doing in gym? Like how long and what kind of lifting exercises?
Thanks,
Steve.
Why can’t I run on the treadmill? Wouldn’t that help me lose more?
Because you’re already on such low cals, it’s unnecessary and could even be damaging to yourself.
The length of time on this program and exercise limitations are inaccurate. Please consult your physician prior to starting, as well. The Cleveland Clinic has a similar program called the Protein Sparring Diet that is extremely effective with proven results but it is intense and monitored strictly by a physician and nutritionist. The monitoring of blood sugars, potassium, ketones, etc. are all critical to your overall well being while losing weight at such an expedient level. The Re feed process is essential to long term maintenance, as well. Good luck!
I started last Friday, Nov 6 after having been on a “plateau” for months. Today is Wednesday, Nov 11. Like Nadia I was baffled by the result! From 142 pounds to 135 just like that in 5 days. No exercise. Like Keith said eating high levels of protein is key to keeping you feeling satisfied. Sardines, sandwich meats and beans and rice pretty much did it for me in the evenings with pears and grapes in between….
Would protein shakes be allowed?
yes but it’s not recommended.
I’m on prescribed medications, such as metphormin, concerta, Zoloft and sertraline, is there any danger with this plan?
please don’t do it.
You mention that the results from this need not be temporary , but doesn’t such a sudden sharp decline in caloric intake backfire by slowing down your metabolism and leading to weight gain when you return to a normal caloric intake?
even if you do, it will most likely just be a little water weight…nothing crazy.
What types of fruits are good to eat on this?
apples, oranges, any high water/fiber fruit..
I heard that weight-loss is extremely fast when you only eat once a day. Aomething about keeping your insulin levels low for that long allows your body to target fat for energy for 23 hrs. Therefore, I know for a fact that this HAS to work. You can eat a HUGE meal when you have 800 calories to spare. 12 oz. of chicken breast (360 calories) 5 cups of brocolli (150 calories) and thats only 510 calories! Still 290 to go! Any input on what I mentioned about insulin levels? Thanks!
-Alex
Eating 1 meal per day only works if you’re eating in a calorie deficit (eating less than you burn). If you fast for 23 hours but then eat 3000 calories, for example, going over your maintenance intake then you’ll still gain weight.
Soo…what’s the plan for week two? I would like to lose 30 lbs ideally and it would be great to lose twenty over the next couple of weeks. Seems…unrealistic. But, assuming it works, would this be a good plan to lose the thirty over next few then maintain:
2nd wk
upping to 1000 calories and light cardio
3rd
1200 calories and start back to hot yoga (3x/wk) 4th
1400 cals/5x heavier cardio or yoga
Then continue 4th week to maintain, fluctuating higher cal days at times.
Sound good or do you have a better suggestion?
Yes it is unrealistic, don’t try to do that.
For calories after this 1 week, go back to eating around 10-12x your bodyweight in pounds.
Thanks!
so if i continue do i still lose weight
huh? What do you mean?