I think 12km per day run is too much, may be u will tired and feel non energetic, dull lazy. And biscuit s bread are not healthy options. Can start sprouts, soaked chana, rosted chana, mix seeds such as flaxseed, vegetable salad...for weight loss so many snacks available, but before starting anything check ur suitable healthy individual snacks options with your dietician /Nutritionist.
Next Steps
consult with dietician/Nutritionist.