Some of the lower-fat dishes are not necessarily lower in calories. When it comes down to two or three choices I look at calories as my final deciding factor. Essentially, most frozen fruits and vegetables are frozen in their natural state which is always best. Canned foods have to add preservatives and sodium to retain shelf life which are not inherently bad but definitely don't add nutritional value. Soup can actually be very healthy and important for many individuals with eating difficulties.
Protein is, without a doubt, very important.
However, eating some protein in every meal is smart for muscle maintenance, healing, and insulin levels. The sources we need to limit are the ones high in saturated fats. There is a known correlation between high amounts of red meat and cancer. The key is moderation in everything. Snacking should be looked at as a positive thing.