I need help with what I should be eating weight loss

Hi i currently weigh 270 5.6ft age 18. i have lost 15 pounds in about a month. I run/jog in the sun an hour 6 days a week. I have the whole exercise thing down i just need help on how i should diet. I have been eating less than 1800 calories a day but what i eat consist of mcdonalds and other bad food for you. Ive still been seeing results but would i get result faster if i ate healthy? please help me I created this account just to seek help.

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