Expenditure of calories per week

Looks like my calculations for the weekly deficit is wrong...

To lose about 0.5kg of weight per week, i need to have a weekly deficit of 3500calories per week. That means, 500calorie deficit per day.

2300 - 500= 1800 kcal.

That's the amount of food that I can eat per day. Ouch.

If I include exercise of 500 kcal. per day.

1300 + 500 = 2300kcal

Looks like I'll really die of hunger. haha.

Beacause a soybean milk + beancurd combo >= 500 kcals.

that means I only have 1000 kcal for lunch if this is the case.

I'm calculating rather pessimistically as I may eat something else during some time other than bf, lunch, and dinner.

NO WONDER... Looks like I cannot have "healthy snacks" for teabreaks already.