[O] caption inside threeparttable

[Vikas Rawal]

I have a table like below. How can I get the caption inside threeparttable? 
Keeping caption outside threeparttable makes it go wider than the table width.

Vikas


#+NAME: energy-cost-uk
#+CAPTION: I have a long caption that is wider than the table and it goes 
beyond the table much to my dislike
#+begin_table
#+begin_threeparttable
#+attr_latex: :environment tabulary :width \textwidth :align lC :center  :font 
\small
|------------------------------------------------------+---------------|
| Food group                                           | Average |
|------------------------------------------------------+---------------|
| alskjd askjd askjdh                     |          1.26 |
| d skdjhf s                                |          9.13 |
| mk dls hds                                 |          4.75 |
| Meat, protein |          4.93 |
| Food and sugar             |          3.11 |
|------------------------------------------------------+---------------|
#+attr_latex: :options [flushleft]
#+begin_tablenotes
#+begin_footnotesize

\textit{Source}: \citet{nicholas2014}.

#+end_footnotesize
#+end_tablenotes
#+end_threeparttable
#+end_table