Taco Bell will never be the healthiest thing you can eat, but in terms of fast food, it’s not half bad. In my anecdotal experience, their quality has gone up across the board compared to years ago, and they’ve also added many healthier customization options (you have to ask for it, though).
This is from their marketing, but it’s pretty honest based on my experience: https://www.tacobell.com/nutrition
I pay some attention to nutrition, and I still eat Taco Bell sometimes even after cutting out most other fast food restaurants.