Yeah it would definitely depend on what they’re eating and also when they’re eating. When I eat too late at night, my blood glucose will be elevated the next day even if I only ate meat. Insulin secretion is reduced at night as melatonin rises because our bodies need to be fasted to rest. If there is not an adequate insulin response to a high protein meal, glucose will stay elevated and this can absolutely affect fat loss.

@Stephen Thomas above 100 after a 12 hour fast