Interesting, but even in the case of your example, one can interpret that lack of sugars can cause mood change, but not consumption of it as is claimed in the p

Interesting, but even in the case of your example, one can interpret that lack of sugars can cause mood change, but not consumption of it as is claimed in the post. To put it differently, causation is tricky to prove, presence of something causing an effect is quite different than absence of something causing it.