as skepticism typically does.
However, this document for the J. of Biological Rhythms (https://journals.sagepub.com/doi/pdf/10.1177/0748730419854197) , as others do, DOES say explicitly say that DST is harmful:
"The chronic effects of DST have not been studied directly, but we know that DST increases the time difference between the social clock and the body clock (Borisenkov et al., 2017). More and more studies show that time differences between the social clock and the body clock challenge our health (Koopman et al., 2017; Mota et al., 2017; Parsons et al., 2015; Roenneberg et al., 2012; Rutters et al., 2014; Wong et al., 2015), are associated with decreased life expectancy (Borisenkov, 2011), shorten sleep (Borisenkov et al., 2017; Wittmann et al., 2006), cause mental (Foster et al., 2013; Levandovski et al., 2011) and cognitive problems (Díaz-Morales and Escribano, 2015; Haraszti et al., 2014), and contribute to the many sleep disturbances in our societies that are estimated to cost approximately 2% of the gross domestic product (Hafner et al., 2017). If we established DST throughout the year, the chronic effects would become more severe not only because we have to go to work an hour earlier for an additional 5 months every year but also because body clocks are usually later in winter than in summer with reference to the sun clock (Kantermann et al., 2007). The combination of DST and winter would therefore make the differences between body clocks and the social clock even worse and would negatively affect our health even more."
Also from the J. of Clinical Sleep Medicine ( https://jcsm.aasm.org/doi/full/10.5664/jcsm.8780 ) :
"DST is less well-aligned with intrinsic human circadian physiology, and it disrupts the natural seasonal adjustment of the human clock due to the effect of late-evening light on the circadian rhythm.(25) DST results in more darkness in the morning hours, and more light in the evening hours. Both early morning darkness and light in the evening have a similar effect on circadian phase, causing the endogenous rhythm to shift to later in the day. There is evidence that the body clock does not adjust to DST even after several months.(26) Permanent DST could therefore result in permanent phase delay, a condition that can also lead to a perpetual discrepancy between the innate biological clock and the extrinsic environmental clock, as well as chronic sleep loss due to early morning social demands that truncate the opportunity to sleep. The chronic misalignment between the timing of demands of work, school, or other obligations against the innate circadian rhythm is called “social jet lag.”(27) Studies show that social jet lag is associated with an increased risk of obesity,(28) metabolic syndrome,(29) cardiovascular disease,(30) and depression.(31) One study found that in the fall, during the shift from DST back to standard time, there was a reduction in the rate of cardiovascular events,7 suggesting that the risk of myocardial infarction may be elevated because of chronic effects of DST.(32) Social jet lag associated with DST may be worse in the western-most areas within a given time zone, where sunset occurs at a later clock time.(33) Adopting permanent DST also would undo the benefits of delaying start times for middle schools and high schools.(34)"
= new reply since forum marked as read
