SLOW FOOD! Make your own food, grow your own food
Check your cupboards—better yet check your grocery cart before the foods even make it to your cupboard. How many foods do you buy in a box? Processed foods are the absolute worst foods for our body—forget about worrying about fat, white flour, sugar, etc – worry about processed and GMO (genetically modified) foods. If you eat fresh foods you will not get too much fat, white flour, or sugar. It is processed foods that get these nutrients (or lack of nutrients) out of balance in our bodies. It is startling to realize that in face of an obese nation, many of these obese people are subclinically mal-nourished! That is right, they are fat from eating too many calories but under nourished from not eating nutrients. This shows the state of our food supply.
Slow food does not necessarily take long to prepare. Prepare your meals from fresh foods; primarily vegetables with a little grain, and for carnivores cooking meat is not difficult nor time consuming. Slow food is just a habit you get into. If your habit is buying prepared foods realize that you are getting primarily GMO foods that have been stripped of nutrients and instead are laced with chemicals, preservatives, pesticides, sugar, salt or MSG . . . basically your anti-nutrients.
Educate yourself about what foods are in season locally (below is a seasonal list of foods, recipes, and explanations)–make these foods the staples of your kitchen, supplement with other foods as you enjoy. Breakfast is best when it consists mostly of fruit and your main meal mostly of vegetables. Look at grains as a vehicle to get vegetables into your body. For example, how many vegetables can you get into a wrap or on rice or over pasta? How much salsa can you get on a corn chip? How many vegetables can you put between two slices of bread? Herbs and spices are also loaded with anti-oxidants and dense nutrition, experimenting and adding herbs and spices to your cooking spices things up nicely 
And where to buy these foods? It is not that difficult to buy from local farmers. We have several CSAs in the area, and we happen to have a great farmers market right here in our back yard. However you do have to know which stands to buy from, as sad as it seems many of the stands at the farmers market have food that were not grown locally by the farmer selling it. My two favorite stands that I know sells their own food that they grow are Pippin Run Farms and D&S Produce. And in the off season if they do buy food from other suppliers they are picky who they buy from and the quality of food they are getting. In addition to a CSA and a Farmers Market ask around and see if you can find a farmer who will sell fresh meat and/or eggs to you (we happen to live in farmland! so this is easier than you think). We are lucky to have a fresh supply of eggs here at the studio from a little farm where the hens are named and loved, fed a natural diet, and live the good life of running the farm yard!
And a word on protein, protein is not that hard to get for vegetarians! Beans and nuts are a great source of protein and easy to add to the diet; include some nuts with your morning breakfast and some beans in your vegetables. Occasional use of cheese or other dairy will also add protein to your diet as will eggs.
With a just a little practice and establishing new habits you can eat healthy and enjoy it!
The information below is based on Ayurveda.