Is there a survey on whether people have gained or lost weight as a consequence of lockdown?

I am not sure if this is the right forum for asking such a question. Moderators can of course close it if it isn’t and please migrate it to relevant site.

Is there a survey/study that statistically checks whether people have gained or lost weight as a consequence of lockdown?

Of course, it would be a complicated as there would be a need for number of controls such as age, usual changes in lifestyle of subjects (independent of lockdown), etc.