I think that is true. But not everyone.
I love Isaiah 58. It's not so much about the suffering at all but about denying OUR pleasure to instead minister to someone else, whether "spiritually" or practically.
In an age where people count calories instead of eating real food in moderation, their bodies are hard pressed to handle cold turkey fasts. So much chemicals from processed foods and medications saturate people's bodies these days. People are addicted to caffene instead of just coffee drinkers. People also don't take the time to fast correctly so they get sick and seriously can't handle fasting completely.
But with common sense, knowledge and a sincere heart, it can and is done, with amazing results.
We were just talking here about throwing an open ended prayer mtg. together. The reality is, many people just aren't that desperate for God. They are content taking life as it comes, even when it's hard, rather than interceding for a miracle. There is SO much that God would do more in if we would just really pray!