அளவுக்கு மிஞ்சினால் அமிர்தமும் நஞ்சு

In mythology, yes. In real life, it's used as a metaphor for anything extremely good, like delicious food or pure love.

Yes! If someone is so obsessed with money that they lose their family or health, this proverb is perfect.

'Nanju' is a pure Tamil word, while 'Visham' comes from Sanskrit. 'Nanju' is preferred in this proverb.

Not at all. It's so common that it's used in very casual settings, often with a bit of humor.

This proverb is the exact equivalent.

Yes, teachers and parents often use it to tell students to take a break and sleep.

Yes. The irony of the proverb is that even the *best* thing becomes bad. If the thing is already bad, use a different proverb.

Yes, '-aal' is used in many sentences like 'Saappittaal' (if you eat) or 'Vandhaal' (if you come).

Because the concept is simple and every Tamil child knows it. It's one of the first proverbs a learner should master.

Yes, if asked about your weaknesses, you could say you work too hard but you remember that 'alavukku minjinaal...'