People love to extrapolate that to "garlic prevents colds", but it doesn't follow. I'm not going to pay to read the full article in this case but you at least have to be careful about this.
Many of this properties are well known (not so well understood). I posted a random quick example, but there are also studies in vivo (rodent models and humans).
"Although it is shown that garlic may have a significant clinical potential either in their own right or as adjuvant therapy in different disorders, however, due to some issues, such as methodological inadequacies, small sample sizes, lack of information regarding dose rationale, variation between efficacy and effectiveness trials, the absence of a placebo comparator, or lack of control groups more standard experiments and researches are needed to confirm the beneficial effect of garlic in various diseases."
Then it must be a cultural thing... =) If you read the first sentence in the abstract you can read: "Throughout history, many different cultures have recognized the potential use of garlic for prevention and treatment of different diseases.".
Here in the Mediterranean, garlic is known to be really healthy (along with red wine and olive oil). Many people eat garlic in the morning just for the health benefits, and we even have (famous?) smashed garlic dishes: https://en.wikipedia.org/wiki/Aioli
> My point was that you have to be careful in general.
Agree. Sometimes more context/evidence is required. My point is that the bioavailability of compounds in food might differ if the food is presented in raw or elaborated/processed form.
It is also "known" that being physically cold causes colds (Mediterraneans are especially paranoid about this in my experience). The majority of studies show this to be either untrue or borderline.
I do agree that there is clear potential for chopping food to affect it's nutritional value. I would expect chopping alone to be of minimal impact in most cases if no other evidence was available. Elaborate processing is rather different.
(Honestly asking, I have no idea.)
The first issue is that you don’t immediately consume it after blending, but wait a few minutes or hours.
The second issue is that the grinding with teeth requires you to spend energy, which reduces the energy you gain from the food.