RN_Amanda

For me, I've rarely experienced Dumping Syndrome. I had my gastric bypass 9 months ago. I had more issues with the "Foamies" but haven't had that issue in at least 4 months or longer ("Foamies" is when you regurgitate what you've just eaten and you over-produce saliva and start vomitting - for me this was a very slow process and not pleasant - it happened if my pouch couldn't break down what I was eating - i.e. I had a hard time processing chicken breast even if it was so small, etc - this was during the stage of real food, not purees or soft ....anything stringy like kale, spinach, celery, etc. And...if I ate too fast).
As far as Sugar & Fat, I never had that issue and I never went Fat Free/Sugar Free either. However, that being said....I don't want to eat fat - especially animal fat, as it made me pretty sick even before my bypass....but I don't necessarily eat Fat Free Yogurt. I tend to look at Nutritional Labels focusing on Protein, Fiber, Carbs. For example, it really depends on the product and it also is a lesson for everyone going through Weight Loss Surgery in Trial & Error. So, you have to see how your body does and if you have any doubt, don't do it. But at the grocery store, I might look at the labels and see what looks like a better fit for me and see how my body does - the Siggis Icelandic Yogurt has less sugar higher protein and my body does great on it. Say for a cheese stick/snack, a regular piece of cheddar is easier for me to digest than fat free.
With fresh fruit, I think it's so important to incorporate, along with fresh vegetables. As far as worrying about the sugar content of fruit, I don't think that's an issue at all. I think it's smart to incorporate fruits into your diet - whole fruits whether fresh or frozen, because it's a good, healthy habit that's so good for your body. I've never had ill effects from eating bananas, berries (some of the best fruit for us!), citrus, you name it. Mind you, I'm a former Type 2 Diabetic.
One thing that I have had issues with is sugar free products. I think that could be with anyone - I find that monk fruit and stevia are so much better on my body. Most definitely too much sugar free products (ethythritol, xylitol, etc.) can have major negative effects on your system. I have learned to proceed with caution - before and after surgery - with sugar substitutes. Also, your taste buds definitely change after surgery as well.
I love using olive oil for cooking. I try to stay mindful and definitely tracking (Baritastic App is my favorite) helps create good habits. Avocados are wonderful, good fats and I try to eat these. I will tell you that my body has "learned" what makes it feel good. For me, the things that make me feel good are oats - just regular, plain oats (not packet) and steel cut are my go-to. Fruit does make me feel good too, I love adding in smoothies with protein drinks and ice and helps me feel great. Greek yogurt does the same. Nut butters without added sugar helps me feel great also. Veggies sautéed in olive oil help me feel good, a light salad and most fish (easy for me to digest and good source of protein). It's all a matter of trial and error but honestly, this is the best thing I've ever done for myself!!
I hope sharing my experiences helps you and best of luck to you!!