Here is ‘why’.
There are key reasons to moderation.
If you have a good base and know your eating habits.
If you have relative good health.
And if your education and economy is relative to a good overall base.
This is just saying, your attitude and resources affect outcomes.
With that said, the environment and personal experience will also effluence outcomes.
A lot depends on your situation.
You may evaluate your limits to help determine if moderation will work for you.
Some of us need to take more extreme action in specific areas of our lives to reduce unhealthy outcomes.