Hi and welcome to the forum! I am glad that I can help you.
You would like to know whether eating a lot of cashews the day before can cause a sudden onset of yellow stools.
The color of normal feces is from yellow to brown. It may be sometimes colored greenish or reddish due to the food consumed the day before, vegetables like salads and beetroot. Consuming supplements, especially those that contain iron, may cause coloring of the feces darker brown to black, which is normal. If the food contains more fats, it gets a yellowish color, which happens in the case of consuming pork meat, nuts, peanuts, cashews, etc.
Given the data that you described, it is likely that you may experience yellowish stools the day after eating cashews. It is a normal condition. Any kind of nuts may cause a weight increase.
Please keep in mind that I provide medical informations only. I am not able to diagnose medical conditions online. Please contact your doctor for further advice and information about the connection between cashews and yellowish stools.
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