Although some people might lose initial water and sodium weight by switching to these types of foods from artificial foods, actual weight and fat loss will only occur if one creates a calorie deficit by burning more calories than they consume on average and over a period of time.
However, I can easily recommend this type of diet for its numerous health benefits- one of which being heightened energy levels which very well could result in a higher TDEE (total daily energy expenditure- your "calories burned in a day").
There is also the possibility that switching to these types of foods will naturally (without thought) result in lower overall calorie consumption due to the fact that one may feel more satiated from 200 calories of grilled chicken vs. 400 calories of french fries, as an example.
If an individual switches from eating 2500 calories of processed foods daily to eating 2500 calories of fresh foods daily and their TDEE does not increase, there will be no loss.
It's not our fault that we are misled about the way weight loss truly works, but we can do something about it by helping spread the truth.