Between water activities of 0.40 to 0.70, the most likely modes of failure will be chemical instability, texture changes, and moisture migration
But caloric restriction, combined with the reduced nutrient density of a smaller total food volume, creates conditions where B vitamins including B12 become limiting factors for mitochondrial energy production
It also allows you to benefit from vitamin B12 without increasing the chance of breakouts
You will not feel jittery, disrupted sleep patterns, or rebound hunger
However, as described in the CY 2004 OPPS final rule with comment period, the development of the copayment methodology generally moves beneficiary copayments closer to 20 percent of OPPS APC payments (68 FR 63458 through 63459)
As for significant weight management results, those tend to show up after a few months of consistent effort