Tacos, I'd say is good to eat if you're watching your diet, that is, if you don't add tons of sour cream and cheese in it. It is a very versatile food in that you can easily substitute the ingredients to make the dish healthier, or simply to suit your preference. For instance, you can use whole lettuce leaves instead of the taco shells. That there will save you some calories. Or you can omit the sour cream and just use salsa. That would definitely be healthier.
My husband wanted ground beef this time around, but we've tried this with ground chicken and turkey too. We even had tacos one time using the vegetarian "meat" (it's made of tofu and alaskan fish meat - but it tasted like beef, I swear).
I have the taco seasoning that I bought from the grocery but due to the sodium content in it, I used only about a teaspoon of it for the meat. I also added garlic, onion and green peppers , a dash of worcesteshire sauce, red pepper flakes, freshly ground black pepper and Emeril's Essence seasoning to the meat for added flavor.
For the veggies, I chopped lettuce, tomatoes and seedless cucumbers. I also added diced fresh avocadoes in it (instead of guacamole, which is healthier). Just a dallop of sour-cream light, salsa and a bit of cheddar cheese... and that's it... an easy and fun Tex-mex meal for us!