Low-Calorie Foods
While researching something else, I came across this list of single ingredients -- mostly fruits and vegetables -- that have very few calories. If you want to reach or maintain healthy weight, eating low-calorie fresh foods is better than ultraprocessed "diet foods."
Most herbs and spices also have very few calories in their usual amounts. Our last Indian meal included a salad that consisted of some lettuce leaves, big spears of cucumber, and a few other bits all generously dusted with some blend of spices. (We didn't get the name of the masala, but I imagine many different ones would work similarly.) The powder stuck to the damp vegetables very well, and contrasted spectacularly with hot/dry against cold/wet. That probably added no more than 5 calories, compared to the usual salad dressings. If you want to avoid boredom in a healthy diet, herbs and spices are your friends, and don't be afraid to use them in unexpected ways.
Most herbs and spices also have very few calories in their usual amounts. Our last Indian meal included a salad that consisted of some lettuce leaves, big spears of cucumber, and a few other bits all generously dusted with some blend of spices. (We didn't get the name of the masala, but I imagine many different ones would work similarly.) The powder stuck to the damp vegetables very well, and contrasted spectacularly with hot/dry against cold/wet. That probably added no more than 5 calories, compared to the usual salad dressings. If you want to avoid boredom in a healthy diet, herbs and spices are your friends, and don't be afraid to use them in unexpected ways.