Appreciable Change

A change large enough to matter

In high-risk diabetes, the immediate goal does not always have to be perfect diabetes management.

For someone at the extreme end of the risk distribution, a more useful question may be:

What change would be large enough to meaningfully alter this person’s physical-health risk?

This is appreciable change.

It means starting from the person’s actual baseline rather than from an ideal standard of diabetes management.

Change from where the person is

A person experiencing six episodes of DKA each year who reduces this to two has not achieved perfect diabetes management.

But something important has changed.

A person taking almost no insulin who begins taking their basal insulin reliably may still have a very high HbA1c. Their diabetes remains far from conventional targets, but their immediate risk may have altered substantially.

Similarly, someone with an HbA1c of 130 mmol/mol whose HbA1c falls to 95 mmol/mol remains above target. Nevertheless, the magnitude of that change is clinically meaningful.

The relevant question is not simply:

Has this person reached target?

It is also:

Has something changed enough to alter the trajectory of risk?

What might appreciable change look like?

Depending on the person, it might mean:

  • taking basal insulin reliably

  • a substantial reduction in HbA1c

  • fewer episodes of DKA

  • fewer insulin omissions

  • accepting and using CGM

  • checking ketones and seeking help earlier

  • reducing insulin restriction

  • reducing severe hypoglycaemia

  • treating depression, psychosis or another psychiatric driver

  • resolving a major housing, financial or social difficulty

  • engaging sufficiently consistently for treatment to take place

These changes are not equivalent, and what matters will differ between individuals.

The task is to identify the change most likely to alter the particular physical-health outcome that brought the person to the service.

Achievable, but consequential

Appreciable change should be:

small enough to be achievable, but important enough to alter risk.

This is not about lowering expectations.

It is about recognising that, in people with very high levels of diabetes risk, substantial health gains may occur well before conventional treatment targets are reached.

The first meaningful change may then create the conditions for the next one.

From psychological change to physical-health change

Diabetes psychiatry is ultimately concerned with physical as well as psychological outcomes.

A person may feel better, engage better or develop a stronger therapeutic relationship. These things matter.

But the clinical question remains:

Does that change eventually reach the diabetes?

Can we see it in insulin use, glucose data, HbA1c, DKA, severe hypoglycaemia, hospital attendance or another meaningful physical-health outcome?

This makes appreciable change an important endpoint of the diabetes psychiatry model.

The wider model

The key ideas fit together:

TAIL → HEAT → LEVER → APPRECIABLE CHANGE

TAIL identifies where disproportionate risk is concentrated.

HEAT helps us understand what is driving or maintaining the current state.

A LEVER is something that can realistically shift that state.

APPRECIABLE CHANGE asks whether the resulting shift is large enough to matter clinically.

The aim is not change for its own sake.

It is change that reaches the physical-health outcome.