Man cannot live on cucumber and celery alone. 😉

More protein, less carbohydrate.  Make sure any carbs you do eat are slow release.  Do eat some, cos high protein diets that exclude carbs (or minimise them greatly) can cause kidney problems.  Avoid sugar ... and its substitutes.  Don't drink fruit juice.  Eat the whole fruit instead (but only about 2-3 pieces a day, if poss).