Too true, fruit juice and smoothies can be very bad for you. If you tried to eat the same fruit that was juiced into your drink you would struggle. There is a lot of fibre and other things which limit sugar consumption from unprocessed fruit.
Wait long enough and every substance we eat will be associated with a study which calls it into question. Then, if chance associates that study with a "slow news day", a relative panic will ensue. As a crusty old medicinal chemist, i offer the best rule of thumb (circa 16th century): [no matter what source it is] the dose makes the poison.
Not to nitpick but this phrasing always bothers me.
Our bodies, most likely, weren't "meant to" do anything by anyone. They've just pondered along adjusting to their environmental stimuli like everything else does.
"Our bodies weren't meant to eat meat."
"Our bodies are only meant to eat meat and nuts."
I love when a nerd forum like HN uses modern conjecture over fact.