Pregnancy weight gain?

hi all you moms and preggies, I just thought i would share my feelings, as i had an appointment at the clinic today. I am 25 weeks pregnant with my 3rd child, wasnt overweight before i got pregnant,but today the doctor said i piled on too much since my last mnths appointment. I have gained so far 6kilos,i used be about 54-55kilos pre-pregnant but not am 61kilos. Is this bad at 25 weeks? thing is i feel so down now, because i truelly feel hungry but he told me to curb my eating,his words were,,,save on the food. pfft. does anyone feel this way? i mean, why is it a big deal that we have to stick to a certain weight? i eat sensibly, i live in Japan so i eat salads everyday, fish most times,,,hardly eat meat, and i walk my dog everyday for about 30-40 minutes, so i dont know how i possibly could be getting so HEAVY. i feel so down, am afraid to attend my next appointment, incase my weight has gone up again. Doc said i should only put on one kilo per month.