"I sometimes suffer from bloating caused by difficulty digesting plant fiber."
"I sometimes suffer from bloating caused by difficulty digesting plant fiber."
"I sometimes get severe bloating from not digesting fiber well."
"My stomach sometimes gets really bloated because I have trouble digesting plant fiber."
「植物繊維の消化不良」は英語では、
* difficulty digesting fiber
* trouble digesting plant fiber
* not digesting fiber well
などで自然に表現できます。