Here are some actual studies on the issue.
Healthy food getting more expensive- study –
“Using retail prices at major supermarket chains in Seattle, researchers at the University of Washington found that low-calorie, nutrient-rich foods—mainly fruits and vegetables—were far more expensive, calorie for calorie, than sweets and snack foods.
Moreover, the average price of the lowest-calorie foods—including green vegetables, tomatoes and berries—increased by almost 20 percent over 2 years. In contrast, in the same time period there was a 2-percent dip in the cost of the most calorie-laden fare, such as butter, potato chips, cookies and candy bars.”
Money Is Tight, and Junk Food Beckons
“Studies show that junk foods tend to cost less than fruits, vegetables and other healthful foods, whose prices continue to rise…Researchers say the experiment reflects many of the challenges that poor people actually face. When food stamps and income checks run low toward the end of the month, they often do scrape by on a dollar a day or less. But many people don’t know how to prepare foods from scratch, or lack the time.”
A High Price for Healthy Food
“Healthy eating really does cost more.
That’s what University of Washington researchers found when they compared the prices of 370 foods sold at supermarkets in the Seattle area. Calorie for calorie, junk foods not only cost less than fruits and vegetables, but junk food prices also are less likely to rise as a result of inflation. The findings, reported in the current issue of the Journal of the American Dietetic Association, may help explain why the highest rates of obesity are seen among people in lower-income groups.”
Junk Food County
“Fannie Charles, 46, lives six miles from the nearest grocery store in rural Orangeburg County, S.C. She doesn’t own a car, so she pushes a cart along the side of the highway. (There are no sidewalks.) It’s difficult, since she weighs 240 pounds and suffers from asthma and type 2 diabetes. That’s why she usually goes only once a month. About once a week she supplements her grocery-store purchases with pricier, less healthy food from the convenience store, just a mile and a half away. At both places she forgoes fruits and leafy greens. “They’re too expensive,” she says. Skim milk is often unavailable. “I get the whole milk, or I’ll get a little can of Carnation evaporated,” she says. Though she often worries about going hungry, she is obese. “I’m stressed. That’s why I’m eating a lot,” she says. “And I’ve got to eat what I have.”
This is the real world of eating and nutrition in the rural United States.”
Healthy Foods more Expensive than Junk Foods
“Overall, there was only a slightly higher increase in healthy food options, but specific items such as milk and bread had increased in price dramatically compared to items such as soft drinks, biscuits and cakes.
“When people are making choices about what they are going to give their kids for a snack and price is a consideration, parents might think twice about serving milk, which is the healthy option,” Dr Burns said.
Diet-related diseases affect more low-income households compared to those in higher socio-economic groups. Cost is seen as a major influence on food purchase. ”
And there are a lot more studies out there. You cannot look at this problem in isolation- as has been mentioned, availability and convenience are inextricably woven into the situation; it’s more than the cost of the ingredients themselves.