Hard Plant, you've stated in other threads that you are relatively new to cycling. You've lost a load of weight, with the benefit of the banana diet thingy.
One thing as an experienced cyclist, is you won't do great on a limited food supply, excluding this person you seem to look upto.
It is a form of eating disorder. Any experienced cyclist will tell you that a diet like this is a recipe for disaster long term. Not sure what cycling you do, but if you are doing 20 to 30 miles every day, commuting to work or training hard, then longer distances at weekends, your current diet won't provide the correct balance of nutrients given that level of exercise.
You obviously won't listen to the many folk on here who have many years of successful cycling on a varied diet. Meat eaters or vegetarians, we must have a varied diet.
Now you've openly admitted you were rather large, and probably got there by a bad diet, and lack of exercise. Now you've got that to a reasonable level now through this new diet of yours, you will have trouble getting the miles up carrying this on. This banana diet man probably makes a mint out of what is a fad, which can be very appealing to folk who may be obsessive compulsive.
Please bear in mind 99.99 percent of the members here won't sign up to this diet, so please don't preach to us .