Best advice is to plan ahead with food that can be re-heated or eaten cold.
On a day when you have the time, cook extra meals and have them in tupperware. Then, when having a hectic day, pack a few meals with you and enjoy.
James 1:16-17 ESV
Do not be deceived, my beloved brothers. Every good gift and every perfect gift is from above, coming down from the Father of lights
With God's help...Mens sana in corpore sano