You might go to the website listed on the article and ask. I personally think there is nothing wrong with lemons and they are used with every liver flush.
The main premise of this cancer plan is cleansing the liver and the bowels. You will see that egg yolks are used with lemons. No plan is 100 percent perfect.
For me I use a local plant here called lufft. This is the leaves of the luffa scrubbers. I also used nigella sativa oil and honey. None of this is mentioned here.
The premise of the diet includes a raw vegetarian diet which is excellent. Deworming with Barefoot and doing the cleanses. I just loved the plan myself and was so excited when I read this.