900 CALORIE/DAY good for weight loss?

Question

Hello :) 
Okay, I'm 18 years old, 164 cm, 55kg and I want to get down to 47kg lean muscle mainly, at a deficit of 600 cals a day (worked it out on calendar cos I'm going on holiday). My BMR is approx 1400 calories. I usually burn 300 calories a day from cardio/strength training, so most days will be eating 1200 calories. On my 1 or 2 rest days, i will be only doing pilates/yoga/abs, and will stick to 900 calories, but a diet full of nutrients, 
e.g. 
Blueberries, strawberries, pineapple (100) 
Yoghurt + cinnamon +10 almonds + square 85% dark chocolate (200) 
Lots of assorted vegetables, olive oil (200) 
Baked salmon +lemony dressing + black pepper (400) 
I was just wondering whether this will have a dramatic effect on metabolism/muscle deterioration. 
I practise intermittent fasting where I eat only from 5pm to 8pm daily, and drink lots of green tea and lemon water throughout the day. I've read that muscle loss only begins after 48 hours of fasting, but don't know whether this is the same for females. 
Please let me know what you think, I'm not trolling, I sincerely want to lose weight/fat. 
Thanks for your help :D

Koldhearted · Accepted Answer

Hell no.

Hun, trust me when i say this

starving yourself is NEVER the answer

I don't know if you've learned in health class yet, but when you starve yourself, your body goes into "starvation mode" where it uses as few calories as possible, and tries to get absolutely everything out of the food it can get (since it's not getting enough).

You'll lose weight, sure. But once you go back to your normal eating habits, your body is still in starvation mode. Your body will still take as much of the nutrients as it possibly can get, and it'll store as much as it can get

In a sense, starving yourself just leads to getting fatter in the long run

genericname85 · Accepted Answer

it´s not healthy but if you have no health issues, you can try a crash diet with ~1000 calories a day and lots of cardio (45 minutes minimum every other day). i do this for about two weeks and then change to a 200-300 calorie deficit a day. don´t do it any longer because sustaining such a high calorie deficit will damage your health.

keep in mind the suggested 1400 cal. are needed to merely sustain your body. if you do a lot of sport your body can easily burn up to 2000 cal. a day. so 1500 cal. should be ok in the long run.

pr3ttyreckl3ss · Accepted Answer

No that sounds very unhealthy, 1200 calories below the 2000 healthy mark. And with the level of exercise you do you need the energy and with such little calorie intake that would be dangerous, if you're already working out you don't need to eat so little. If your eating nutritious food it's ok to eat more than 900 calories, your not going to gain an inordinate amount of weight. by the way for your height and 47kg is not unhealthy (I'm 5'4, 110 lbs, it's just genetics) it's just within the low spectrum but still healthy BMI, as is your current weight.

twelveangrymen · Accepted Answer

Im trying to lose 56lbs and I use a weight loss app called Lose It. I type in my age, weight and height and I chose the lose 2lbs a week option. And I try to type in all my calories. Its a free app and I lost 22lbs so far.you have to log everything you eat. Its great for people who really can't afford support from a weight loss program or meeting and you don't have to lose 2lbs a week you can start off with 1lb or 1.5lbs a week.

Anonymous · Answer

Simply put- unhealthy.

Weight loss or bulking takes time. People seem to think that if you amplify the weight loss method, that it equals quicker results. Your body needs ~2000 calories for a caloric maintenance diet. Mid-1000's is what you'll be aiming for to have a healthy cutting diet.

You can't starve your body and then expect your metabolism to not respond by storing nutrients away so it doesn't starve. You need to nurse your body into weight loss, not shock it.

Anonymous · Answer

Stupid idea, you will be too tired to exercise, couldn't function properly. It would hinder your progress. Plus you'd be unhappy with your appearance still...I bet you'd resemble something like a gaunt drug addict or something (if you could even keep this idea up).

Another unusual thing to consider: If you get so preoccupied with your diet and exercise it can psychologically screw you up. My sister was a model and became obsessed with her figure. She developed some disorder and started eating in her sleep. She would wake up and her kitchen would be trashed with empty bread packages, etc. She thought her roommate was being messy/freeloading until she caught herself on camera (that she set up to get "evidence" of her roommate doing it). She had to see a therapist to get rid of that habit.

TheGoodTheBadTheHOT · Answer

I've said it before but that is terrible, unsustainable, unhealthy and most of all, undesireable.

Please dont cut your calories so low. I can't say for all men but i find it really unnatractive when a girl starves herself

BoopBoopBeep · Answer

You'll lose muscle on that and end up skinny-fat. You need to understand the purpose of protein, carbs and (good) fats. If you're working out this is seriously deficient in protein and waaaaay imbalanced overall. You may end up a size 2, but you'll have arms 8 inches around and 7 of it will be fat.

whattothink · Answer

Actually I have read that it is not good to go below 1200 calories a day, because your brain needs a certain level of calories to function properly. If anything it sends your body into starvation mode which means you keep all calories consumed vs burning them. Your body also uses muscle for energy vs fat which is not good as well.

Anonymous · Answer

Look up your numbers in a calculator online.
It takes me 2500 calories a day just to be.
Losing weight isn't about starving yourself in a short period.

Its about creating a deficit that overtime will cause your body to burn off fat due to increased workload.

Starving yourself won't give your body enough energy to even burn off fat and build muscle correctly when you exercise.

lumos · Answer

No. It would be very unhealthy to do that. You're already at a very healthy weight, why do you want to lose more? You'd be underweight at 47 kg. Don't do it.

AndyWes · Answer

That's devotion, lol.  Though with eating that little, and fasting, will you even have the energy to workout?

SamuelB · Answer

900 is too low.  It's not enough to support your body's basic metabolism.  1200 is a much better number.

JustinCaseUDontKnow · Answer

I would say a unhealthy diet, not enough calories you would definitely need more if your going to work out and exercise

16charger · Answer

Try my fitness pal app it will tell you your needed calorie intake based on your weight,  height, and activity level. . I hope this was helpful. Good luck

rgb008 · Answer

Eating 900 calories per day is not a healthy way to lose weight.

Anonymous · Answer

You'll loose weight but it'll mostly be water weight and yes, muscle mass.

900 CALORIE/DAY good for weight loss?

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