five articles:
https://www.foodnetwork.com/healthyeats/healthy-tips/2013/04/how-to-prevent-vitamin-loss-when-cooking-vegetables
https://www.healthline.com/nutrition/cooking-nutrient-content
https://hopkinsdiabetesinfo.org/how-to-keep-the-nutrients-in-your-veggies/
https://www.cnn.com/2016/05/05/health/healthy-vegetable-cooking/index.html
https://ucfhealth.com/health-tips/three-of-the-healthiest-ways-to-cook-vegetables/
four Grokker collections:
Cooked Vegetables https://grokker.com/cooking/collection/cooked-vegetables-beans-tempeh-tofu/6032d1c26cd106116a98819d
Salads https://grokker.com/cooking/collection/salads/64e1e8dfdb434d4c4d786807
Healthy Nutrition https://grokker.com/cooking/collection/healthy-nutrition/603ad327b356ab7d31b48ff0
Cooking & Baking Technique https://grokker.com/cooking/collection/cooking-and-baking-technique/603ad570b356ab7d31b49206