Does soaking and boiling for too long can reduce the nutrients?
Is red beans and green beans are often heated again will affect the damage to the nutritional content?

How many calories in a bowl of red bean porridge and green beans plus coconut?

Indeed the process of storing and processing of food, greatly influenced the content of nutrients. Makanani soaking can cause nutrients, especially vitamins that dissolve in water (C and D), missing.

Food is heated at a certain temperature too, especially if repeated, can remove some nutrients. Because of that, cook it and soon enough to eat, so you do not need to warm it up again.

To know for sure a food calories first needs to know the weight or proportion. A bowl of red beans or green beans with coconut milk can contain prospect 3000 calories.