According to Dr. Robert Young of the ph miracle living ranch and author of "Sick and Tired" NO you cannot become too alkaline. For more info on him look at www.phmiracleliving.com go to the blog post section for lots of info. Or get the book. It is fantastic. Healthy blessings to you Lilian.
According to Dr Young, yes, Sodium bicarbonate is what is supposed to form in the gut to digest food and acid, but most people are lacking in it due to bad diet. Go to the webside www.phmiracleliving.com and read up. He sells a product call Phoursalts which is sodium bicarbonate, calcium bicarbonate and 2 other mineral bicarbonate. If you take it you will be alkalized within 24 hours. Good stuff, testamonials of cancer patients being healed when using his protocol. Good idea to take chlorophll while taking sodium bicarbonate to perfect your blood.
Also, be sure you are drinking enough water so you dont get dehydrated. Also depending on your age and if you have high blood pressure. Do some research before starting anything of course. Dr. Simonconi in Italy is curing cancer with sodium bicarbonate. You can see more info about that at www.knowthecause.com