Tamasic people gravitate toward food that is stale, tasteless, foul-smelling, decomposed, leftover, and impure. Such food dulls both the body and the mind.
The word "yatayamam" literally means food that has been sitting for a long time after cooking. Freshly prepared food starts sattvic, but as hours pass, its quality degrades. Cold, stale, spoiling food increases tamas — heaviness, lethargy, and dullness.
The teaching is deeply practical. Eating fresh, clean food matters not just for physical health but for mental clarity and spiritual growth. What goes into the body directly influences the quality of one's thoughts.