Calorie Deficit method to loose weight

Hi guys,

So i am sort of new to MFP have a slight understanding on having a calorie deficit. I am just confused on what my calorie intake should be, from MFP advising to stick to a 1200 calorie diet but then when you add an excercise it will provide you with "calories earned" and to make it more confusing there are websites out there that say don't base your calorie intake based on online calculators which calculate your BMR then provide you with a figure to Maintain, Loose or gain weight.

With this all being said i just need clarification on what i should be doing based on my fitness goals i am hoping to atleast loost 5-10kg (since when i started training 14/04/14) until the end of july

I am 23years old - 161cm - started at 72kg. I have started doing a fitness group and in 5 weeks have lost 3kg which i do

- Mondays 90 Mins of Arms circuit (ropes, weights, burpes etc)
- Tuesday 90 Mins of Legs Circuits (squats, lunges with weights 10kg -15kg dunbell or round weights etc)
- Wendesday 45mins of Abs class with 5-10kg weight
- Thursdays 90 mins of Boxing with gloves and pad
- Saturday 45mins Full Body HIIT spritns warm up - the full body workouts
- SUNDAY REST

i have been doing this for about 5 weeks now and feel i havent lost as much weight as i would of expected still 3kg is a great achievement but especially around my stomach area, as the number on the scale hasn't moved only until this week but i can sometimes see a progress with my photos though and understand it may just me gaining muscle!. I also drink 2-3 L water a day

From my understanding my BMR is around 2400-2600 calories to maintain my weight on various online calculators when i minus 500 approx 1 pound a week and 1000 Calories 2 pounds a week it brings me to about 1400-1600 this is where i get confused..

Should i be lowering my calories or sticking to a 1400-1600 range?? or am i just hitting a fitness platue

here is the link to my typical day i also don't eat meat, as i am pescetarian who only eat fish and seafood any tips please let me know! http://www.myfitnesspal.com/food/diary/nk1201?date=2014-05-20 :)

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