Well calorie deficit and walking helps but since u want to lose fast I’ll tell u, 1)intermittent fasting, works the best, 2) calorie deficit, it’s non negotiable 3) cut out sugar, dairy, gluten and high glycemic index foods, so u see, we need to keep our blood sugar level low in order to make our body burn fat so ur gonna do exactly that, by reducing carbohydrates and drink fiber before ur meals ( I drink flax seed and chia seed) 4) increase ur protein intake, so I won’t get hungry rapidly 5) don’t wast ur energy on cardio bc it’s not gonna do much instead it’s gonna make u feel hungry, try lifting weights if u can go to the gym 6) if u r serious about it try water fasting, it’s the best trust me but don’t forget to drink electrolytes while fasting and do ur research about it befor starting please These tips might be “unhealthy” but ik how it’s like to want to lose weight fast and I’ve done these things myself and it made me lose 6kg in 3 weeks