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It turns out that you can sometimes go wrong with eating salads and veggies. Squash, kale, broccoli, Brussel sprouts, among other leafy greens can cause problems if consumed before a long workout. They are high in indigestible carbs and can cause bloating or gassiness. Also, they can interfere with the production of thyroid hormone. The thyroid can become enlarged and develop into a goiter.