The picture below shows that, in reality, no ONE study can answer a question. In fact, when trying to reproduce 56 big published studies, Dr. Glen Begley found that only SIX studies reached the same result. Scary right?

Therefore, to claim that something is true we need MANY studies pointing to the same result. Ideally both long term observational (prospective cohort studies) and experimental studies (RCTs). Systematic reviews and meta-analyses are a good way of getting an overview of all studies trying to answer the same research question.

Sometimes there is no evidence, and in that case the best thing to do is to speculate based on experience and existing studies (which means that you need to know what evidence there IS).

This does NOT mean that you should make up an explanation based on cherry picked studies (i.e. LCHF “carbs make you fat because insulin”).

So the next time you assume something to be true: Find out if the “fact” is level A true, with many observational and experimental studies to back it up, of level D to G BS! 😋

Stay rational!

Categories: Science

Related Posts



Did you read a hot new study on a diet which has won your affection? Let’s not rush things. Here’s what every honorable scientist and sceptic needs to know about how to judge if a Read more...


Red Meat Vs Smoking

‘What the Health’ claims that red meat is in the same WHO category as tobacco when it comes to cancer. Have they fooled you with this statement? First off, cancer has been associated to PROCESSED Read more...


Are you over-confident in your fitness expertise?

Ever noticed how you feel very entitled to argue on a topic after watching a documentary or reading a book on it? Before learning about a topic, we are usually aware of our limitations, but Read more...