Here's a fascinating video about the spiritual consequences of eating three meals on Shabbat with intention. The three meals are: Friday night, Saturday morning and Saturday afternoon/evening, prior to sunset and havdallah.
The traditional blessings said over our meals is one way of connecting with Hashem before we eat, which is something we generally understand. The idea that sitting down to the meals is, in itself, a powerful connection with deep spiritual meaning is not as well-known or understood.
Rebbe Nachman's teachings on the consequences of our willingness to sit down and eat with intention three times on Shabbat are life-changing. We are not eating merely to nourish our body, but also, to save our souls. Yes, it is a powerful teaching I plan to remember. Shabbat Shalom!