Baba following about fasting:

The body will survive for 95 days if one remains only on water. Just as the body feeds on food, so the mind feeds on desires and indulgence in these desires feeds the mind and the ego. So, by starving the mind of these desires, the ego becomes very thin and weak.

In a physical fast, taking only water as you did yesterday, lust is lessened, but anger and hope are increased. During the first three days of a fast, hunger is marked, depression is strong, anger is strengthened and lust is diminished. From the third to the seventh day, there is a fluctuation in feelings: hunger, depression, anger and lust are all lessened, while hope — for everything — is still strong. On the tenth day, the feelings again swing back, and there is increased hunger and anger. This lasts until the 14th day, when the feelings again become calm and remain calm. Thus, after the 14th day, a fast has no spiritual value! ( pp-2269-1942)

To eat meat is detrimental to some extent in controlling one’s sexual nature. The main disadvantage is that eating meat increases sexual desires. Consciousness exists in stones, but there is so very little consciousness in stones – almost nothing. It is in vegetation that the evolution of consciousness begins. And consciousness increases as an animal form evolves into another animal form; in man it is complete. With the advance in consciousness, sexuality also increases. The more the consciousness, the more the sexual longing; and the less the consciousness, the less the sexual longing. So, if we eat meat, the degree of sexuality increases in us; but if we remain on vegetarian food then it neither increases nor decreases. (Lord Meher, 1st. ed., Bhau Kalchuri, Vol. 2, pp. 624 – 625.)

Fasting does not increase love. No connection exists between them. All austerities, repetition of God’s name (japas), penances, et cetera, are quite apart from this fast I am telling you to do. Therefore, as long as I do not ask you to fast, why should you? If you want to fast on your own, fast in such a way that your stomach remains full while your mind starves! This is the best fast. (Lord Meher, 1st. ed., Bhau Kalchuri, Vol. 13, p. 4782.)

Baba answered him in detail:One man of the sahavas group asked, "Baba, what do you mean by fasting the mind? I don't try to think, yet thoughts come!"

If such small points start cropping up, there will be no end to explanations. What is fasting of the mind? It is to have no thoughts. This in itself is impossible, but remembers me as often as you can and then your mind will not be in a fumble as to what to think of. You leave your mind to me by having my constant remembrance or taking my name, and there will be no food (thoughts) worth the name for the mind to feed on. Thoughts of me will supersede all other thoughts in your mind.

There is no necessity to starve the stomach. You can do it for your health, but not for spiritual reasons. We are in the habit of eating food at regular intervals. With a few exceptions, when we feel hungry our stomach craves for food, although we may be engrossed in some other work. But when the mind is occupied in some work, the stomach feels satisfied. It is our nature to look at the clock when it is time for food. If we purposely fast, our eyes would constantly be on the clock to see if it is time to break the fast. By such fasting, the bindings become strong.

When I ask you to fast, it is something different.

Lord Meher, 1st. ed., Bhau Kalchuri, Vol. 13, pp. 4821 - 4822.