I don't think there's a way to readily avoid it, unless you can grow and process the crops yourself. Organic food, afaik, more times than not is worse than run-of-the-mill industrial products so tread carefully. Unfortunately I don't have much advice to give here since I cut out gluten almost entirely from my diet.

one tip is avoid GMO foods. the mods make the food resistant to glyphosate, so they can spray it heavily and the crop survives, weeds don't. more gets in your body though.

there are also many google-able tips, such as washing foods better, choosing organic, eating less processed food and more, e.g. https://janeshealthykitchen.com/avoid-these-foods-with-monsa...