modus ponens, denying the antecedent, migraine cause

Well, fasting off everything besides nightshades will most certainly give you a migraine as the body dumps toxins…

As James noted, you need extreme conditions to isolate food variables…

To add to that, those extreme conditions can be indiscernable from what you are trying to figure out!

A catch 22

Turmeric is great advice - one of the best edible anti-inflammatories…

It’s even good at preventing cancer

A study recently came out that inflammation is the highest known precursor to cancer

That’s cute only humean…

“If” implies “only if”…

There’s not really a logical distinction

It’s like saying “the” and “only the”

They both mean the same thing

The: that which is implied

If: that which is hypothetically implied

They almost mean the same thing

They both imply singulars…

It’s redundant to add a singular

I think you read him wrong. He’s pointing out the difference between, “if”, and “if and only if”. It’s a necessity/possibility thing.

If P then Q == if P occurs, Q will occur. But then Q might occur anyway for some other reason.

Iff P then Q == if P occurs, Q will occur. And Q cannot occur without P.

Correct.

If it rains, I’ll have my umbrella.

If and only if it rains, water will fall from the clouds.