Science can now explain why low calorie diets are more healthy and intermittent fasting (eating every 16 hrs) can lead to longevity.
The freshness of the New Year is a reminder that God lavishes us with life, provision, and new mercies. At the time of the Exodus, Yahweh told the people of Israel to pick up just enough manna each day for their households, six days a week. He gave enough for every day--no need to worry, no need to hoard, no need to gorge.
Do not fast with the flesh, but be moved by the Spirit of God into fasting. Jesus was led by the Spirit into the wilderness to fast.