How can nutritional science be made more accurate?

[sanantone]

On the subject of diet. There is a lot of studies. But there is no pictures of the before and after of a person to sustain those studies.
(I am not taking about the marketing campaigns promoting diet). I just would like to see plain before and after pictures with real
people for every proposed diet. And then a follow up. Why it is so hard ? Maybe they all know that their proposition do not pass
a reality test.

Scientific studies don't display pictures of participants. That would be considered unethical. An IRB would never approve that. Plus, these people are often considered patients, so their healthcare information is confidential under HIPAA.

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Speaking of scientific research, there was a study released several years ago that found that people lost the same amount of weight no matter which diet they were put on. The study had groups of people who were on various diets and even no special diet at all. The constant was that everyone ate the same number of calories. This led the researchers to conclude that cutting calories was more important than anything else.

Now, we have physicians and scientists saying that calories in/calories out is oversimplified and people should go on low carb diets without counting calories.