This may explain part of its universal appeal. On the other hand, results from clinical studies may advance our knowledge concerning non-clinical issues, which are relevant for most humans.
In western or westernized societies in particular, food is abundant, cheap, and available in a great variety. This shows the effect of both under and over gratification in the oral stage of psychosocial development.
Many individuals are able to do this successfully, yet some exhibit over-regulation of eating behavior resulting in underweight and malnutrition.
Sweetness would be associated with foods that are ripe and foods that are ripe are going to contain more sugar. It also helps you learn and practice using positive coping self-statements.
For instance, there are some problematic eating behaviors that are not included in the current diagnostic manuals, but are continuously debated in terms of their clinical relevance cf.
In contrast to our ancestors, however, whose primary task was to seek out any food that would provide energy and nutrients, those choices have become more difficult nowadays.