Food insecurity is linked to higher rates of diabetes, obesity, depression, and developmental delays in children, with effects that ripple across nearly every aspect of physical and mental health. In 2024, 13.7 percent of U.S. households (18.3 million) experienced food insecurity at some point during the year. The health consequences go far beyond hunger: people who are food insecure spend roughly $1,800 more per year on healthcare than those who are not, adding up to an estimated $77.5 billion in excess national healthcare costs.
The Hunger-Obesity Paradox
One of the most counterintuitive effects of food insecurity is that it often leads to weight gain rather than weight loss. When affordable food options are limited, people tend to rely on calorie-dense, nutrient-poor foods because they stretch a tight budget further. A box of processed snacks costs less per calorie than fresh vegetables or lean protein.
But the explanation goes beyond just food choices. Chronic worry about having enough to eat raises cortisol, the body’s primary stress hormone. When cortisol stays elevated over time, it disrupts the hormones that regulate appetite and energy use. Specifically, it can cause resistance to leptin, the hormone that signals fullness. The result is increased appetite, reduced calorie burning, and fat storage, particularly around the abdomen. This creates a biological pathway where the stress of food insecurity itself promotes weight gain, even independent of diet quality.
There’s also a psychological dimension. Research on what’s called the Resource Scarcity Hypothesis shows that when people perceive financial scarcity, their desire for caloric resources increases. The feeling of not having enough money and the desire for high-calorie food reinforce each other, driving overconsumption when food is available.
Type 2 Diabetes Risk
Adults who experience food insecurity are two to three times more likely to develop type 2 diabetes than those with reliable access to food. The combination of higher obesity rates, poor diet quality, and chronic stress all feed into this risk. When your diet consists largely of refined carbohydrates and added sugars because those are the cheapest available options, blood sugar regulation suffers over time. Managing diabetes once it develops is also harder without consistent access to nutritious food, creating a cycle where the condition worsens precisely because the circumstances that caused it persist.
Nutrient Deficiencies That Compound Over Time
Food insecurity doesn’t just mean too few calories. It frequently means the wrong calories, leading to specific micronutrient gaps. Iron deficiency is the most common and best-documented problem. People experiencing food insecurity are significantly more likely to be anemic and to have lower iron stores, with women at particularly high risk. Iron-deficiency anemia causes fatigue, weakness, difficulty concentrating, and reduced immune function.
Vitamin A deficiency is the second most commonly identified gap, with food-insecure adults showing lower blood concentrations of vitamin A and related compounds called carotenoids. Older adults who are food insecure also tend to have lower levels of vitamin E. Deficiencies in zinc, folate, vitamin B12, and vitamin D round out the picture. These aren’t abstract lab findings. Low vitamin D weakens bones. Low folate during pregnancy increases the risk of birth defects. Low zinc impairs wound healing and immune response. Each deficiency layers additional health problems on top of the chronic diseases food insecurity already promotes.
Mental Health Effects
The psychological toll of food insecurity is substantial and often underrecognized. Not knowing where your next meal will come from, or whether you can feed your children, generates chronic anxiety that persists even on days when food is available. A systematic review and meta-analysis found significant links between food insecurity and increased rates of depression, anxiety, and sleep disorders.
This isn’t just situational sadness about a difficult circumstance. Food insecurity involves a specific kind of psychological distress: feelings of deprivation, restricted choice, and persistent worry about food supplies. These experiences activate the same chronic stress pathways that affect physical health, meaning the mental and physical consequences reinforce each other. Depression makes it harder to plan meals, shop strategically, or cook. Anxiety disrupts sleep, which worsens blood sugar control and immune function. The psychological burden of food insecurity is both a health outcome in its own right and an accelerant of every other health problem on this list.
Effects on Children’s Development
Children are especially vulnerable because food insecurity strikes during critical windows of brain and body development. Food-insecure children aged two to five have 1.57 times the odds of being diagnosed with a developmental delay or behavioral problem compared to children in food-secure homes. The effects span communication, motor skills, social-emotional development, problem solving, and school readiness.
Iron deficiency in infancy is particularly damaging. It can impair motor, social-emotional, and cognitive development in ways that persist into the preschool years and beyond. Children experiencing moderate to severe food insecurity have more than twice the rate of needing support for social-emotional and self-regulation skills compared to food-secure peers.
Timing matters. One longitudinal study found that children who experienced food insecurity at both 18 months and four and a half years were more likely to show persistently high levels of depression, anxiety, hyperactivity, and inattention through age eight. Another found that very low food security during preschool predicted more conduct problems (like tantrums) and poorer engagement with learning in kindergarten, even after accounting for earlier food insecurity. Persistent food insecurity throughout early childhood added hyperactivity to the list of behavioral concerns. These aren’t temporary setbacks. They shape a child’s trajectory through school and beyond.
Pregnancy Complications
About 14 percent of pregnant individuals in one large study of over 19,000 deliveries reported food insecurity during pregnancy. Compared to food-secure pregnancies, food insecurity was associated with a 13 percent higher risk of gestational diabetes, a 28 percent higher risk of preeclampsia (dangerously high blood pressure during pregnancy), and a 19 percent higher risk of preterm birth. Babies born to food-insecure mothers were 23 percent more likely to require admission to a neonatal intensive care unit. These complications affect both the immediate health of mother and baby and long-term outcomes, since preterm birth and low birth weight are linked to chronic health problems later in life.
Older Adults Face Compounding Risks
For older adults, food insecurity intersects with aging in ways that accelerate decline. Food-insecure seniors are more likely to report fair or poor overall health and to have multiple chronic conditions, including diabetes, depression, hypertension, and heart disease. They’re also more likely to have limitations in activities of daily living, meaning difficulty with tasks like bathing, dressing, or preparing meals, which in turn makes it even harder to obtain and prepare nutritious food.
Programs that address food insecurity in older adults, like home-delivered meals and nutrition assistance, have been associated with reductions in hospitalizations, emergency department visits, nursing home stays, isolation, and depression. This suggests that for many older adults, food insecurity is a modifiable factor in what might otherwise look like an inevitable decline.
Cardiovascular Health: A Complicated Picture
The relationship between food insecurity and heart disease is less straightforward than with diabetes or obesity. A large meta-analysis covering more than 190,000 people found that when researchers measured blood pressure directly, food-insecure adults didn’t show significantly higher readings than food-secure adults. However, when people self-reported a previous diagnosis of high blood pressure, food-insecure individuals were 46 percent more likely to say they’d been diagnosed. This gap may reflect differences in overall health awareness, healthcare access, or the fact that blood pressure fluctuates and a single measurement may not capture someone’s full cardiovascular picture.
In children, the evidence was clearer: food insecurity was associated with 44 percent higher odds of elevated blood pressure. Given that food insecurity drives obesity, diabetes, chronic stress, and poor diet quality, all of which are independent cardiovascular risk factors, it likely contributes to heart disease even if the direct blood pressure link in adults remains nuanced.
The Financial Cycle
Food insecurity and healthcare costs create a feedback loop. After adjusting for age, race, education, income, insurance status, and where people live, food-insecure individuals still spent an average of $6,072 per year on healthcare compared to $4,208 for food-secure individuals. That extra $1,863 per person represents money that could have gone toward food, housing, or other needs, further tightening the financial constraints that caused the food insecurity in the first place. At a population level, the estimated $77.5 billion in excess healthcare spending represents a significant potential return on investment for programs that address food access directly rather than waiting to treat the chronic diseases it produces.