As a first step, try the below.
– knock out “white carbs” and stodge, i.e. white pasta / potatoes, white bread / flour based products (esp. pies!)
– anything with excessive fat, i.e. chicken with skin on, pork, lamb is a no-no unless trimmed
– feed your face on green leaves, they rock. Particularly with a nice balsamic and mustard dressing
– carrots are good as are cashews and brazil nuts
– all fish is good unless it is surrounded by an inch of batter and accompanied by chips. In this case it is bad
– veg NOT fruit
– If you feel the need then black coffee and red wine work
I occasionally get lethargy and / or refulx / general malaise, The above with plenty water works for me*
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Disclaimer: This may not work for everyone