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.


hello , I do my workout before eating (whene I’m fasting ) or after ? . thanks
doesn’t matter.
Hi there! I’ve been on an 800 calorie diet for a a little over a month. I weighed myself this morning and got so discouraged In the passed 9 days I have lost only 800 grams. Is this normal? I really can’t lower my calorie intake as it is already quite low.
why on earth would you do it for a month? It absolutely wrecks your metabolism which is why I specifically said to do it for a week. I would immediately boost back up your calories to above maintenance for at least 2 weekss to “repair” your metabolism.
I weigh 280ilbs. Do you think i could go longer?
You could since you’re heavier than average but i would start at 1 week first.
Hi,
I weigh 198 pounds.. And need to lose 14 lbs in a week. I’m 5 feet 5.5 inches. Age 33. Can this happen if i follow your plans. What should be the weight of the weights for the weight training?
probably not 14 pounds, close to 10 is more likely.
Hey! This is what my trainer has me doing long term – but a little higher calorie intake. 1000 a day – 105g protein with 3 days heavy weights and the only deviation being 5 hours of cardio a week. I’ve lost 8 lbs a month consistently with this. Overall this method works well! The last week before my Vegas trip I will try your plan to the T. Not sure if it can help those that have only about 10 pounds to lose anyways. Shedding water will still help with definition.
Keith, who the hell are you anyways?
just some guy… 🙂
Then how do i know that your right? I dont want to start this then bulk up. Because from the little i can see in that picture you look a little built.
I was wondering why you can’t do any running if you’re on this diet?
800 is an Extreme deficit for most people. It would be stupid to add any additional activity on top of it.
Why is it not working for me i followed it through step by step. Does it really work
i have no idea, are you tracking your calories?
hi, I’m 16f and I’m 5’8. I have all my life been naturally skinny. People tell to eat a burger all the time and I actually do eat A LOT. A few months ago I suddenly got scared of gaining weight (I was 102 lbs). I suddenly counted how many calories I take in. I realized On an average day (not eating out) I only eat around 800 calories a day and it felt like A LOT. Since I have become aware of my eating habits and being scared to gain weight, it made me eat way more because food is constantly on my mind and I’m now 109 lbs. anyways, idk where I was going with this or even if I was expecting any replies on this, but, that’s my story.
No no no!
DO NOT DO THIS DIET IF YOU”RE 16. You will ruin your health.
Elaborate??
you’re too young to be eating such low calories.
I did it for one week and i shat my pants with water
you serious?
I literally just lol`ed
how 800 calorie diet will cause maximum weight loss? 800 calorie means 5600 calorie in a week and it cause a defficit of 11900 calorie ( if a man really need 2500 calorie a week) , then it will cause a 3.5 pound deficit a week.. that means reducing of 1.75 kg weight….. but i cant understand thee theory behind it … can u plase explain?
you lose a lot of water weight in the process as well.
i’m a mommy of a 2year old. before pregnancy i wieghted 123 hieght 4’11 yeah short and i was 23yrs. i’ve gained 70 pounds during my pregnancy. left me at 193.
now i’m 25 and i weigh 150 2wks ago..
took me 2yrs to lose 43 pounds.
it’s been 2wks since ive been doing this.. ive been eating 900 calories per day.. 45 min cardio workout 4 times a week and i drink a bottle of water per day just tiny sips every time.. not the whole bottle in a minute or hrs or soo.. just tiny sips here and there.. most after cardio.. get plenty of rest. so yeah i’ve lost 6pounds in 2weeks. i am now 144 and i sometimes higher my calories daily slowly until my body gets use to it and i eat more healthier now and have alot of energy..
Hey I’m 338 pounds I’m 25 years old how long could I do this for and make my metabolism faster
since you’re heavier, you could technically do this longer than most but I would still be careful. I’m not a doctor so consult a medical pro.
Im 5’6″ female @ 150lbs, age 32. I can do 800 calories for a week. Would my lose be at 10 or 15lbs?
yes, but it would probably be closer to 10.
After following this diet, how do I keep my weight? Cause I wouldn’t want to get the back once I stop the program.
Also I lost 2pounds in 3days now , is it too fast ?
no that seems about right, most of it is probably water.
The whole point of this program is to quickly shed the most fat in a week. A lot of people lose 10 pounds but what most don’t realize is that most of it is water weight so when you do go back to normal, you might gain a tiny back to due water weight. I would multiply your bodyweight by 10-12 to get your dailys calories to continue losing weight at a slower pace once you stop this diet.
First of all thanks for all the tips .
Also , …dude! I eat less than 650 calories a day and she’d just 3 point something in 6 days , can I keep following the diet for the whole month ( OR MORE )?
I have a lot of weddings and parties in the summer so .. 😉