I had intended to give a soylent based diet a go - unfortunately something was nutritionally missing as I started developing bleeding gums.
Now I'm experimenting with a low carb vegetarian diet comprised of Tofu, Soybean Noodles, steamed vegetables, and occasionally a little grassfed butter and parmesan cheese to go with the noodles.
I've been making my own iterations of the Trademarked, Tp-Fuel, for years now..
Gives you +4
Troll
Power, (get it?)

It's been my breakfast and lunch everyday for the past 2 years.
But overall, eating large dinners, late night taco bell, snacking on ramen, alcohol (erodes inhibition/will power), has prevented me from actually getting Cut..
Tp-Fuel 3.7 Ingredients:
Chicken Breast
Carrots
Onions
CabbageExplanation:
Originally, I had experimented with more strong flavored ingredients, but it then becomes exhausting to eat over the course of several weeks.
Things like Celery/ Cilantro/ Tomato/ Leak/ Garlic were the strong flavors I've tried.
I've found the current list to be a good balance because Post-cooking, it's mostly a soft flavor, and not so sharp.
As for the protein, The reason I've not gone with soy, is because I'd need an Immense amount of it to get the necessary proteins, and it's very hard to replace the "alleged" necessary amino acids which come readily from animals..
The issue with soy so far
Trypsin inhibitor (debilitates body's protein digestive process), haemagglutinin (clumps red blood cells), goitrogens.. etc