What is the cause of the 80+ pounds of excess weight that our client [name withheld] is unable to shed and steadily increases despite all her attempts to curtail it?

This is karmic, as you saw intuitively. This is the consequence of previous lifetimes of abuse, followed by a desperate need to avoid future episodes and the adoption of a strategy to make the self less attractive physically, by putting on excess weight in the hope of being bypassed by predators. This is a somewhat logical strategy embraced by the subconscious mind but without a reasoned and high-level appreciation of the trade-off, that it not only shuts out the predator but may shut out possibilities of love from some potential life partners who would bring much love and joy of a divine nature and add tremendously to the life satisfaction, as well as the health consequences in being a drain on energy, and potentially other adverse changes within the body that could cause malfunctions to accumulate and accelerate the aging process indirectly, and result in reduced longevity. When the problem is truly the unhealed wounds of trauma, it is more logical and truly highest and best to heal that trauma and not take on additional burden and potential liability as a coping mechanism that is a poor fit to the true problem, which is the carrying forward of the negative emotions incurred by abuse. To release those negative emotions is the best solution. As you know, there are multiple ways this can be done, so this individual simply needs further healing work and will be helped by the array of services you can offer, including HMR and subconscious channeling, as well as DNA ThetaHealing, and a combination as well will have a synergistic benefit.