# description list (of math) with one item not in bold

I have a list of some math items, and I would like one not be bold, but next nonetheless. I.e. in this list I want FOOD and DOOD to be in regular text,

\documentclass{book}
\begin{document}
\begin{description}
\item[$77$]  seventy-seven
\item[FOOD$_{t}$] Food.
\item[$\textup{DOOD}_{t}$] Dood.
\item[$\delta$] Delta
\end{description}
\end{document}

• \textnormal, not \textup – egreg May 28 '18 at 13:28
• So simple. Thanks. If you add your comment as an answer I am happy to mark it as answered in full! – Eric Fail May 28 '18 at 13:48

The command \textup only acts on the shape attribute, not on the series. On the other hand, \bfseries is in force when typesetting the item descriptor, and \textup will not touch it.
What you need is \textnormal that resets all font attributes (except size).