Jane Weaver, Health Editor at msnbc.com explains how to do it in her article, Skip the dollar menu! Eating well on a budget: You don’t have to ruin your diet to survive the economic downturn.
Here are some key points from the article:

You don’t need protein in large quantities to be healthy. Make dishes with less protein to save money. 
Incorporate more vegetables (fresh and frozen are great)
Don’t overlook eggs as a great source of protein — make an omelette or a frittata with lots of veggies.
Dollar menus are mostly junk. If …

Celebrity Chefs Tyler Florence, Curtis Stone and Cat Cora helped families a few weeks ago. Showing them how to prepare healthy dishes for their families and spending a lot less money than they did ordering out and buying frozen dinners. 
Each chef prepared a week’s worth of recipes!

The people over at Real Simple have another great article for us, 7 Principles of Healthy Eating.
Here are a few of the highlights:
1. Know yourself. Find a healthy way to cook and eat that works for you. If you love a large, sit-down dinner, for example, ignore conventional wisdom that says it’s best to eat lots of small meals (just be sure not to snack all day if you plan to feast at night).
Plan for pitfalls. If, say, you often nosh while you work, bring in a healthy snack from …

You don’t need a sophisticated survey to establish that most Americans are overfed – a casual look around will suffice. What may not meet the eye is that while most of us are getting more than we need in terms of calories, refined carbohydrates, saturated fat and sodium, we’re significantly malnourished when it comes to key nutrients. 
The five most glaring deficiencies are:

potassium
vitamin E
magnesium
vitamin A
fiber

For example, 99 percent of women and 90 percent of men fail to get adequate potassium, a shortfall that may contribute to alarming rates of high blood …