OK...I know it's not as simple as this, but does anyone have any insight on how either of these two variables might be playing a role in what feels like a recent fat gain around the mid-section. They are the only two things I can identify that have changed since I started feeling bloated. Diet's the same, sleep's the same, all other activity the same, stress is low.
I've gained fat around my belly over the past 2 months and...
Once you stopped the fish oil, did you make sure to get enough omega 3 via diet? Also, the omega ratio is as important as the overall amount, so it could be that your fish oil megadose was balancing out your omega 6 intake and putting you within the right range of ratios.
What does your diet look like? Also, how's your sleep/stress? This sounds like it might be a cortisol issue.
I'm not sure if I can make a connection between your problem and kettlebell training, but it seems easy and logical to add the fish oil back into your diet to see if this is the answer. If fish oil is truly the answer, I would suspect that your diet minus the fish oil needs to be reexamined (perhaps you're taking in too many omega'6 fats and your omega-3/omega-6 ratio is skewed too far in the wrong direction without supplementation). If supplementing with fish oil does not solve the problem and all variables (diet, sleep, activity, stress etc.) have truly remained the same, I would be concerned that there might be an underlying issue here. Purely speculation, but those are my initial thoughts.
Is it jiggly or solid? My hubby and I have been joking about developing upper belly "outy abs" that seems to be related to picking up and putting down a wiggly 35 lb. bundle of energy a million times per day. So maybe a kettle-ball could do a similar thing. We've been trying to figure out what what we're doing form-wise that could cause this, and I do find myself pushing my belly outward when I lift sometimes. What is your belly doing when you lift that kettle-ball?