Dieting without loosing muscle

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i am currently dieting, and aiming to loose roughly 5-6 kilograms, 15 pounds, i am doing this by dieting a using a punch bag for cardio,

 

though one thing on my mind and which had been suggested b4 by various forum members is that dieting will make you loose muscle, this is something that i certainly do not want but i have been told that loosing muscle is inevitable if you want to diet. Therefore i would like to ask what are the essential foods that i should eat to insure a minimal muscle loss when dieting. I know the obvious food groups such as protein, meats etc..., but are there any other foods to consider?

[Bon]

I did a low carbohydrate, high protein diet and dropped 3kgs of fat in one week, while increasing muscle mass. I increased the number of push ups from 70 to 80, after doing 3 sets of normal push ups with weights on my back, 3 sets of push ups with my hands up the stairs and 3 sets of push ups with my feet up the stairs.

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hey bon, its could to speak to you again,

 

so what did that diet consist of?