Am I gonna lose body fat if I only eat chicken and broccoli?

Answer 1

Depends on how much of it you eat. If you consume fewer calories than your body uses, then you'll lose some fat. If you consume a lot fewer calories than your body uses, then you'll lose fat AND muscle.

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You can use this calculator to help determine what your daily calorie intake should be https://www.freedieting.com/calorie-calculator and FYI, chicken and broccoli do not provide the body all the nutrition it needs.

Answer 2

Thats a good start, but you need cardio. Low carb with cardio will burn fat.  Beginning of the year I got back to the gym and doing 30 min interval cardio and lower my carb intake and i dropped from 186 to 170 in 3 weeks