Those who bear the brunt of starvation are often boys and girls under 5 years of age, the elderly and the women. Women will often give the food to the men and children first, and themselves only after that. More than 1 billion people live in households that earn no more than a dollar a day per person. They have no land to farm and they can't buy what they need to eat. Right now, almost half of the people in South Asia and Sub-Saharan Africa live in such absolute poverty.
Poverty makes people malnourished.
In its turn, their malnutrition impairs their performance in school and work, and makes them more vulnerable to disease. This makes it harder for them to get good jobs which could free them from poverty. War breaks up the farming cycle and the marketing and distribution of the farmers' harvest. Worse, in far too many situations, food supplies are plundered or stolen, and never reach the people who need them the most. In some countries, even if fighting never occurs, heavy military spending drains money away from food production, education, and health care.