Girls who are breastfeeding. How do you eat? That milk would go away a…

Girls who are breastfeeding. How do you eat? That milk would go away and his weight would go away. I eat almost everything (except fast food and junk food) but rarely. Just don't have time to eat sometimes or forget ? and started noticing that milk became like it was less, breasts don't get full enough and the baby is already hungry.