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More research is needed to develop reliable non-invasive, rapid diagnostic means

The researchers also note that around 30% of people taking metformin may develop vitamin B12 malabsorption (the inability to absorb B12 in the body) over time

That's available in just three ounces of sockeye salmon, per vitamin manufacturer Centrum, or a three-ounce lean beef hamburger, per SF Gate

While slight weight gain will likely not impact your results, anything more than that can start to increase mass on the abdomen, if not other areas more likely to gain fat due to the presence of existing fat cells like the buttocks, thighs, and back