What do systematic reviews say?

Intensive glycaemic control vs conventional glucose control

Intensive glycaemic control showed no clear difference in mortality compared with standard glycaemic control (moderate certainty).

• Effect of the treatment of Type 2 diabetes mellitus on the development of cognitive impairment and dementia 2017 · Cochrane Headline outcomes only
  RR 1 [0.79, 1.26]
  3 studies · 15888 participants
  Moderate
• Targeting intensive glycaemic control versus targeting conventional glycaemic control for type 2 diabetes mellitus 2013 · Cochrane Headline outcomes only
  RR 1 [0.92, 1.08]
  24 studies · 34325 participants
  Moderate