In a small trial, people lost more weight and fat while eating a diet rich in minimally processed foods than they did eating a diet high in ultra-processed foods.

It seems that you can lose weight while eating ultra-processed food - but to a lesser extent than if you cut them out. Ultra-processed food lacks a set definition, but is generally considered to include ingredients that are never or rarely used in kitchens,

People who ate more typical home-cooked meals lost twice the weight of people eating ultraprocessed foods that met healthy nutritional guidelines, study finds