I do not know if I can agree with how that is worded. I can understand what you are getting at, but not the final synopsis. The problem is trying to ascertain the level of need with regards to food because it is natural to eat or should I say... we have to eat. It is not natural or should I say it is not a physical need like food to use
drugs or smoke or drink alcohol, so in many ways it cannot be compared.
Now I do agree that some people have an obsession with food to the point where they have no control and can snap, become moody and so forth. In
these times they may lose the Spirit based on their choices, but not based on being fat. To try and explain myself better... you may smoke marijuana to the point of being incoherent about a certain choice you should make and end up making the wrong choice - do we blame the drug for the lost of the spirit or choice? In some cases both - but initially we must blame the individual who initially took the drug.
You see food is like a modifying factor in our daily routine. It can cause decisions to be made easily or more difficult, but in the end it is still our choice, and in that choice we lose the Spirit. An obese person who has good self control (save for the eating disorder) may be able to make very good choice all the day long and
keep the Spirit. Maybe he will not be open to something more that the Lord has for him, but it does not mean he lost it.
Now with all that said... the Word of Wisdom includes dos as well as do nots. I feel Latter-Day Saints focus so much on the do nots that they believe they are living the Word of Wisdom because they do not do something. That is like saying... I do not steal and I do not kill so I am good to go. The Word of Wisdom was also made for the
weak and
weakest of all Saints or those who call themselves Saints - in other words - being so large to the point of obesity should not be an issue.