[satokema]

No, that is LITERALLY science. You come up with hypotheses and test them.

Hypothesis: [Specific diet] will cause no effects on myself, given my unique biochemicalpsycho makeup.

Hypothesis: [Specific diet] will cause [list of benefits/mali] for myself, given my unique biochemicalpsycho makeup.

etc.

Just because it doesn't automatically apply to the population at large does not make it "not science".

[notheguyouthink]

Well I imagine what OP meant was that the testing phase in this "science" is not verifiable/repeatable/etc. Perception is an awful way to perform tests, and is very frequently wrong.