Table rowspan and colspan

You could use the multirow package to organize the cell in the north-west corner of the table, and the tabularx package to automatically generate four columns of equal width. In the MWE below, the \newcolumntype instruction sets up a new column type, called "Y", that centers its contents. Adjust the value of the \arraystretch macro to get the amount of vertical stretching to your liking.

\documentclass{article}
\usepackage[margin=1in]{geometry}
\usepackage{multirow,tabularx}
\newcolumntype{Y}{>{\centering\arraybackslash}X}
\renewcommand{\arraystretch}{2}
\begin{document}\pagestyle{empty}
\begin{tabularx}{\textwidth}{|*{4}{Y|}}
\hline
\multirow{2}{*}{State of Health} 
  &\multicolumn{2}{c|}{Fasting Value}&After Eating\\
\cline{2-4}
             &Minimum       &Maximum &2 hours after eating\\
\hline
Healthy      &70            &100     &Less than 140\\
\hline
Pre-Diabetes &101           &126     &140 to 200\\
\hline
Diabetes     &More than 126 &N/A     &More than 200\\
\hline
\end{tabularx}
\end{document}

The http://www.tablesgenerator.com/ site is helpful - it also knows about multicolumn.

More a comment than an answer, since this is likely to be aiming a clinical or scientific audience, tables should not have lines with a few exceptions. Referenced on Beautiful table samples I was very happy with https://www.inf.ethz.ch/personal/markusp/teaching/guides/guide-tables.pdf .

For comparison, this is how you can typeset the same table in ConTeXt. (Notice the similarity between the HTML markup (had you used CSS) and the TeX markup).

\setuppapersize[A4,landscape]

\startsetups table:layout
  \setupTABLE
      [
        width=150pt,           % Fixed column width
        height=2\lineheight,   % Fixed row height
        align={middle,lohi},   % Middle aligned cells
        frame=on,              % Border around cells (default)
        offset=none,           % Equivalent to cellpadding=0
      ]
\stopsetups

\starttext

\bTABLE[setups=table:layout]
  \bTR
      \bTD[ny=2] State of Health \eTD
      \bTD[nx=2] Fasting Value   \eTD
      \bTD After Eating          \eTD
  \eTR
  \bTR
      \bTD Minimum \eTD
      \bTD Maximum \eTD
      \bTD 2 hours after eating \eTD
  \eTR

  \bTR
    \bTD Healthy       \eTD
    \bTD 70            \eTD
    \bTD 100           \eTD
    \bTD Less than 140 \eTD
  \eTR

  \bTR
    \bTD Pre-Diabetes \eTD
    \bTD 101          \eTD
    \bTD 126          \eTD
    \bTD 140 to 200   \eTD
  \eTR

  \bTR
    \bTD Diabetes      \eTD
    \bTD More than 126 \eTD
    \bTD N/A           \eTD
    \bTD More than 200 \eTD
  \eTR
\eTABLE
\stoptext