I will not say what I do, or don't do. Instead, when we think about our own fasting or when we are tempted to consider the fasting of others, here are some helpful things that I like to keep in mind:
The direct guidance of Our Lord on this issue:
“When you fast, do not look somber as the hypocrites do, for they disfigure their faces to show others they are fasting. Truly I tell you, they have received their reward in full. But when you fast, put oil on your head and wash your face, so that it will not be obvious to others that you are fasting, but only to your Father, who is unseen; and your Father, who sees what is done in secret, will reward you." (St. Matthew 6:16-17)
From the holy Prophet Isaiah:
"Is not this the kind of fasting I have chosen: to loose the chains of injustice and untie the cords of the yoke, to set the oppressed free
and break every yoke? Is it not to share your food with the hungry and to provide the poor wanderer with shelter— when you see the naked, to clothe them, and not to turn away from your own flesh and blood? Then your light will break forth like the dawn, and your healing will quickly appear; then your righteousness will go before you, and the glory of the Lord will be your rear guard. Then you will call, and the Lord will answer;
you will cry for help, and he will say: Here am I." (Isaiah 58:6-9)
From the Didache, chapter 8: "But let not your fasts be with the hypocrites, for they fast on the second and fifth day of the week. Rather, fast on the fourth day and the Preparation (Friday)."
From the sayings of the Desert Fathers:
Abba Isidore the priest said, 'If you fast regularly, do not be inflated with pride, but if you think highly of yourself because of it, then you had better eat meat. It is better for a man to eat meat than to be inflated with pride and to glorify himself.'
In a village there was said to be a man who fasted to such a degree that he was called 'the Faster'. Abba Zeno had heard of him, and he sent for him. The other came gladly. They prayed and sat down. The old man began to work in silence. Since he could not succeed in talking to him the Faster began to get bored. So he said to the old man 'Pray for me, Abba, for I want to go.' The old man said to him. 'Why?' The other replied, 'Because my heart is as if it were on fire and I do not know what is the matter with it. For truly, this when I was in the village and I fasted until the evening, nothing like this happened to me.' The old man said, 'In the village you fed yourself through your ears. But go away and from now on eat at the ninth hour and whatever you do, do it secretly.' As soon as he had begun to act on this advice, the Faster found it difficult to wait until the ninth hour. And those who knew him said, 'The Faster is possessed by the devil.' So he went to tell this to the old man who said to him, 'This way is according to God.'
There are many more such quotes by many fathers if you wish to seek them out.
Note the theme of humility, secretiveness, and lack of judgment that runs through these passages. We must consult with our priest and know ourselves as we attempt to fast as the Lord has commanded us to do. But above all, in our fasting, however it is done, we ought to flee from pride, judgment, and hypocrisy. If we are not fasting from these things, we are not fasting from sin, and we are thus truly not fasting at all.