Could be, or could be a wheat sensitivity. Not necessarily an older-guy problem; the only benefit of youth in many cases is the ability to cover up and ignore major issues that really should be addressed.If you're not taking fish oil, that's the first place to start. If 3g of that stuff (1g with each meal) doesn't help, then try doing your carb binge with some gluten-free baked goods.Also keep in mind that most donuts contain hydrogenated oils, which are problematic. Joint stiffness often stems from fatty acid imbalances and often resolves with corrected fatty acid intake too.And yeah, try different baked goods for the carb binge (remember: gluten-free + vegan = bonus carbs), see how you feel. Can't hurt to try.