Cooking, Storage and Nutrient Retention

How you store and cook food affects its nutritional content more than most people assume, and not always in the expected direction.

Where losses occur

Water-soluble vitamins, particularly vitamin C and folate, are lost through leaching into cooking water and through heat degradation. Boiling causes the largest losses; steaming, microwaving and stir-frying retain more. Prolonged storage reduces vitamin C substantially in fresh produce, which is why frozen vegetables frozen shortly after harvest can contain more than fresh produce transported and stored for days.

Where cooking helps

Some compounds become more available with cooking. Lycopene availability increases with heat. Beta-carotene absorption improves with cooking and with fat. Cooking breaks down cell walls, increasing accessibility generally. Some antinutrients that impair mineral absorption are reduced by cooking, soaking and fermenting. So raw is not automatically better, and the common assumption that it is misreads the picture.

Practical points

Steam or microwave rather than boil, or use the cooking water. Add fat to vegetable dishes to improve carotenoid absorption. Buy frozen without hesitation. Store fresh produce cool and use it reasonably promptly. Cut vegetables closer to cooking rather than long in advance. And keep this in proportion: eating vegetables at all matters far more than the preparation method, and a preparation method you enjoy enough to repeat beats an optimal one you avoid.

A note on Cognicept

We publish this blog on the Cognicept official website, so treat anything we say about our own product as coming from an interested party. Cognicept is a liquid dropper supplement taken daily, and it makes no claim to treat, cure or prevent memory loss, dementia or any other condition. It also has a documented verification problem we cover in our reviews and complaints report.