What fills an 8-hour eating window well
On 16/8, the fasting hours are usually limited to water, plain tea, and black coffee, while all food sits inside the 8-hour window. A common structure is two protein-anchored meals (and perhaps one small snack) built around vegetables, a quality protein source, whole-food carbohydrates, and some healthy fats. The shorter window makes meal quality more important, because there are fewer chances to cover nutrient needs.
Protein at each meal supports satiety and lean-mass retention, and fiber-rich vegetables help fullness stretch across the long fasting stretch.
Avoiding the common pitfalls of the window
The window does not make calories irrelevant: it is easy to offset the benefit by packing the eating hours with calorie-dense, low-satiety foods. Hydration and electrolytes matter during the fast, and breaking it with a very large, fast-eaten meal can cause discomfort. Quality and balance inside the window do most of the work.
This is general educational information, not dietary advice. A qualified professional can tailor intake to individual needs and any medical conditions.