Eating Raisin Bran For Diet?

Will i lose weight if i eat raisin bran for 3 meals a day but with fruits and eggs for breakfast and tuna fish for lunch and dinner im 18 turning 19 SOON and my weight is somewhere in the 220's and im 5'11 and im planing on joining the Marines late this year so my recruiter told me that i have to be at 200 are less and i run every nite in my back yard until i run till failure will this help me lose weight if yes how much would i shed a week