It's funny how many scientific atheists sneer at the religious for their beliefs when there's so much corruption in their own ranks... and that's coming from someone who'd rather believe in science than any form of organized religion...
I'm not keen on using the word science like it's some sort of faith that you choose to passively agree or passively disagree with. You shouldn't have faith in science or institutions based on science, because that is antithetical to the whole premise of science.
Science is a methodology and framework for investigating the world around you. There are broadly accepted scientific bodies of work, but they're supposed to be continually tested and verified and challenged. You're not supposed to accept studies or peer reviewed papers at face value. You're not even supposed to accept the current body of knowledge as fact. Even the most tested laws are just theories where the error bars are very small. Don't get me wrong, laws should be respected, but until the margin of error becomes 0, it can be challenged. We award the Nobel Prize to people who have convincingly challenged the current body of science. Einstein isn't revered because he sealed Newton's laws as immutable truths. We revere him because he added dimension and new ideas that we could test and explore.
Companies and institutions have been undermining science with self-serving research, press releases and books since the beginning. People will always execute scientific research poorly and others will always do despicable things to undermine it. Fortunately, scientific thinking comes with some error correction mechanisms. They're not perfect and sometimes it takes longer than we'd like, but typically our body of knowledge gets better over time. Nutrition in particular is a very difficult subject to study, so it's especially ripe for junk science. I suspect as our tools for research get better, our knowledge of nutrition will get better.
Science doesn't work when people accept a scientific body with faith. Faith has no place in science, because faith teaches people to accept ideas without challenging them. We want each generation of scientists to question every link in the chain of arguments, so they can add testable theories and new dimension to today's "infallible" theories.
If you want to reinvigorate your "faith in science", start by changing your expectations about science. The scientific method is a great tool, but it doesn't solve the problems of corruption and incompetence. Practicing science is messy and error fraught, propagating accurate scientific knowledge can be incredibly slow. It's always been this way, but if we persist, sometimes we get really lucky and we're inundated with new knowledge and insights, better tools, and lots of testable ideas.