Oh @goggles 400 calories a day is very low and could put your body into starvation mod where it instinctively tries to hold on to any excess weight to save itself from starving to death. Be very careful.
A lot of people recommend calorie counting apps like myfitnesspal to track how much you are eating. It also gives you a daily target for calories to consume.
You should combine a calorie controlled diet with moderate exercise and set small goals.
I’ve just started a diet, my first mini goal is to lose 4kg by 10 September this year. Ultimately I want to get down close to my premed weight of 57kg. I’m starting from 65.2kg.
There is an exercise and diet support thread on this forum too. Exercise & Diet Support Thread! 💪 🏃 🏊
You can do it, just take it slowly. Maybe look into meal replacement shakes like optifast. I don’t know what country you are in. I use meal replacement shakes in my diet. Three per day and a healthy dinner. It’s the only way I can lose weight because I’m not good at controlling my food.
Good luck with it.