Talk to Dietitian/Nutritionist on Weight

my height 5.4 weight bipolar medicine increase my weight 32 kg now 90 kg from 3 days i am on diet 900 calories morning 150 calorie dalia 54 calorie apple 1 banana 60 calorie afternoon 1 chicken pice with brad bread 1 pice night 150 calorie dalia 54 calorie apple 1 banana 60 calorie around 1 glass low fat milk . i read low calorie diet slow down metabolism i also take green tea a day please help me to increase metabolim walk 2.50 kilometer help me to increase my metabolism