The higher graded meats generally have this marbling and are correspondingly more expensive. These actually make meat harder to cook because it dries out so easily. Vegetables Cooking vegetables has a similar purpose, only here we are dealing with the softening of cellulose fibers and the conversion of insoluble pectins into soluble pectins. The problem again is that overcooking can lead to degrading of flavor as well. This seems to us as silly as not owning an automobile because some careless people use them foolishly.
Food is to be enjoyed in sensible quantities and in a balanced way.
You can have too much of any good thing, and if you concentrate on our richest recipes without moderation you will probably put on some weight. However, if you eat what you need and enjoy what you eat, you will be much happier. There are times for sensible eating and occasional times to splurge.