Anytime you incorporate more fruits and vegetables into your diet, you will be helping to lower cholesterol and blood pressure. Check out this recipe for a good example of what you could put in your Blast: http://www.nutriliving.com/recipes/blood-pressure-ambrosia.
Incorporating fruits and veggies will also help with your kidney function, it may not increase the function but it will help support an overall healthier body.
The best thing to do at this time is to start with a one Blast per day. Fill your tall cup with half vegetables, 1/4 low glycemic index fruits like peaches, pears, apples, cherries, apricots, figs, grapefruits and berries. Use unsweetened almond milk, coconut water or regular water as your liquid base and add some superfood boosts like chia seeds, hemp seeds, flax seeds, ginger, turmeric, spirulina. Play around with that outline and find what works for you. You may want to decrease the amount of protein your are eating, for now aim to eat no meat 2-3 times per week. That will help to take some of the work load off your kidneys. Monitor your phosphorus levels with your doctor, if those start to rise we will modify your Blast plan. Ensure you are staying hydrated throughout the day and decrease processed foods from your diet, they are high in sodium and too much sodium can put additional stress on your kidneys.
Don't be afraid to eat real food, just make sure each meal is balance and eat clean.