"Fasting" is not eating. It's usually done for the span of a few meals, or a full day (24-hour period or simply daytime), or even a few days.

"Intermittent" might mean fasting once every few weeks, or once a week, or every other day, or even every daytime (as for Muslims during Ramadan).

"Good" means a longer life with fewer diseases and less physical or mental decline.

Some references:

http://en.wikipedia.org/wiki/Fasting#Benefits

http://www.bbc.co.uk/news/health-19112549

http://articles.latimes.com/2009/feb/02/health/he-fasting2