Whats more effective for burning fat?

JamielovesKU
I am a bit over weight. 5''5' and 195 pounds. I am really looking to lose the weight, but what burns weight faster? Diet or excersise? Like if I just eat healthier and just walk and do little excerise, will I still lose the weight? And how effective are the fat burning foods such as grapefruits?
Eating fat burning foods will be most helpful for the fat burning.
Doing exercises is most effective for burning fat.
other. What?
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Whats more effective for burning fat?
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