If a man submits to a diet of 9500 kj per day and expands energy in all forms to a total of 12000 kj per day

If a man submits to a diet of 9500 kj per day and expands energy in all forms to a total of 12000 kj per day. What is the change in internal energy per day ? If the energy lost was stored as sucrose (1632 kj per 100 g), how many days should it take to lose 1 kg ? (Ignore water loss for this problem).