If i cut out all takeaways will i loose weight?

i end to indulge on takeaways alot im not fay or anything but when im with my friends on the weekend we all eat really bad like mcdonalds kfc you name it.. if i cut them out and excersise everyday would it help with weight loss? i live at home and my mum cooks dinner its not bad food but its hard to go on a strict diet while everyone at home eats the same things