Micronutrients & recovery
Food processing techniques, specifically blanching, can reduce antinutrients (oxalates, phytates) in wild vegetables, thereby potentially improving the bioavailability of minerals like iron and calcium, though it may also cause losses of heat-sensitive vitamins.
When preparing wild leafy vegetables, blanching them in hot water or steam is recommended. This process reduces bitter tastes and, crucially, lowers levels of antinutrients like oxalates and phytates that block mineral absorption. While some heat-sensitive vitamins may be lost, this trade-off often results in better overall mineral bioavailability. Ensure you do not over-blanch to minimize nutrient loss.
there is a general consensus that blanching is an effective means for reducing antagonistic nutritional factors in green vegetables... significant reductions in oxalic acid, and concomitant decreases in phytic acid and polyphenol contents... following blanching.
Why this rating
The paper cites multiple studies showing contradictory results on vitamin retention but consensus on antinutrient reduction.
Source
The suitability of wild vegetables for alleviating human dietary deficiencies
Michael V. Flyman et al. · South African Journal of Botany · 2006
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