Packaged tofu usually is pasteurized and will be identified as such on the label. Tofu sold in blocks from water filled basins generally is not. Stress is different for each of us. According to this view, zero stress makes us happy and healthy. The only time you have zero stress is when you're dead.
Stress can be the kiss of death or the spice of life.
The issue, really, is keeping it under control. You can plan your life so stress doesn't overwhelm you. Effective planning involves setting priorities and working on simple problems first, solving them and going on to the more complex difficulties. When stress gets out of control, it's difficult to prioritize where you're going to devote your energies. All your problems seem to be equal and stress seems to be everywhere.