How many calories should i eat? help please!

Hi all,

So my BMR is calculated as being 1,378 calories a day.

I weigh 144 pounds - goal weight is 126 so i need to lose 18 pounds. I am aiming to lose a pound a week to get there.

When i put this into my MFP goals it says i need to eat 1220 net calories a day. I aim to work out 3 times a week but i always have a "treat meal" on a saturday so my calories for that day work out around 1800/2000.

Is it ok to stick to 1220 a day and eat more on one day a week - therefore eating back some of my exercise calories in one day? im worried about eating too little as dont want my metabolism to slow down! thank u xxx

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