Be really careful with Dr Barnard. You'll find there are a lot of removed search entries that have been handled under the European Data Protection Act. That's always an interesting. He's also the founder of the PCRM, the Physicians Collective for Responsible Medicine. This has some interesting links with PETA and suggests that the vegan philosophy they espouse is more related to animal treatment than health necessarily, ostensibly matching one set of results to meet a different set of requirements.
Some of the "evidence" that he has used in past books and films has also been strongly questionable.
The approach is similar to MangoMan, so by all means watch, but be aware that there are undercurrents.