@eckhart carb based foods are part of a healthy balanced diet, they contain nutrients that aren't or aren't as readily available in other foods.
I don't believe in any diet (in the broad sense not just weight loss) that cuts out or rather massively reduces a food group.
We are built to eat a variety of foods to gain all the nutrition we need.
Several nutrients are better absorbed if consumed at the same time as foods containing certain others eg vitamin c and iron rich foods aids iron absorption
I'm not advocating a HIGH carb diet but a balanced healthy one - which includes carb based foods
Also the 1950s diet in the UK was so boring, no wonder people were slim
What's also often forgotten is that most adults smoked then too which is an appetite suppressant.
@HotPatootiebootie well said!
@Batshitbeautycosmeticsltd I didn't see that thread but it doesn't surprise me
Now, now, Graphista, this is MN. You know there's no such thing. They are all keto and run 10km before work and then strength train daily. Anyone who doesn't is either fat or definitely, without a doubt, going to become fat if they don't low carb, 100% for definite 
So true!
@Eckhart ironically the first time I learned how to assess a piece of research starting with "who funded it and what is their agenda" was while doing my nursing degree!