It is a huge market but competition is brutal.  There is possibility of waste and spoilage.  Since there is no barrier to entry, every body can enter into the market and be a competitor.   Supply chain infrastructure can wreck havoc on the business as well as Acts of Nature like floods, typhoon earthquake, kotong policeman and the like.
I have seen presentation where a a multinational packaged food company sells $1billion worth or P50 billion a year   That was a decade ago;   maybe they are selling twice as much $2 billion worth.
A fastfood company sells about P200 billion worth annually. 
Would you like to be in this market?  
From PSA