Which recommendation would be best for reducing nutrient loss in foods?

Not enough detail. 
But the best way to reduce nutrient loss in food in my opinion and some research is eating less empty calorie foods such as sugar, and eating more nutrient dense foods such as whole wheat bread instead of white bread, Brown rice instead of white rice etc. 
Eating complete proteins, the right fats, omega 3. 

Eating them raw. Eating them fresh

There is tumerous cancer, kawaski disease and more.

D. contract and relax