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Calorie restriction for long-term remission of type 2 diabetes

Roy Taylor
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DOI: https://doi.org/10.7861/clinmedicine.19-1-37
Clin Med January 2019
Roy Taylor
ANewcastle University, Newcastle upon Tyne, UK
Roles: director of Newcastle Magnetic Resonance Centre
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ABSTRACT

Starting with a hypothesis which postulated a simple explanation arising from the basic cause of type 2 diabetes, a series of studies has introduced a paradigm shift in our understanding of the condition. Gradual accumulation of fat in the liver and pancreas leads eventually to beta cell dedifferentiation and loss of specialised function. The consequent hyperglycaemia can be returned to normal by removing the excess fat from liver and pancreas. At present this can be achieved only by substantial weight loss, and a simple practical and efficacious method for this has been developed and applied in a series of studies. For those people who used to have type 2 diabetes, the state of post-diabetes can be long term provided that weight regain is avoided. The implications for personal health and for national health economics are considerable.

KEYWORDS
  • Type 2 diabetes
  • reversal of type 2 diabetes
  • liver fat
  • pancreas fat
  • first phase insulin response

Established beliefs about type 2 diabetes

Type 2 diabetes has long been regarded as a lifelong condition which is inexorably progressive. Despite modern treatments, long-term complications remain common and devastating. These clinical observations are backed up by detailed studies showing that 50% of people require insulin therapy after 10 years of type 2 diabetes.1

The underlying pathophysiology of type 2 diabetes seemed clear: insulin resistance together with a steadily progressive beta cell defect. The United Kingdom Prospective Diabetes Study (UKPDS) showed that beta cell function had declined to around 50% of normal by the time of diagnosis,2 and continued to decline irrespective of pharmacological treatments.3 Histological studies using insulin immunostaining to identify beta cells appeared to confirm this with a 50% decrease in beta cell number at diagnosis.4 This was presumed to reflect continued death or apoptosis of beta cells. To assess whole body insulin resistance, the insulin clamp became regarded as the gold standard method, even though this predominantly assesses muscle. Insulin resistance in muscle was established as the earliest detectable warning sign that type 2 diabetes may develop.5 The predominant focus of research has therefore been to identify better ways of improving muscle insulin resistance by drugs (eg thiazolidinediones). The apparent loss of beta cells appeared impervious to therapeutic intervention.

The consequence has been that people are told at diagnosis that they must get used to having a chronic disease, with major risk to eyesight, feet, heart and brain. But these entrenched beliefs were based only on data from groups of people who steadily gained weight (approximately 5 kg in the intensively treated group of UKPDS).

The twin cycle hypothesis

Research on liver insulin resistance in relation to liver fat content offered a potential breakthrough in understanding; the higher the liver fat, the greater the insulin resistance of the liver.6,7 Given that insulin action regulates hepatic glucose output, excess fat in the liver could explain fasting hyperglycaemia. But how about the beta cell defect which was always associated with development of type 2 diabetes? Surely a disease as common as type 2 diabetes must have a single cause, and not separate disease processes in different organs? What if excess fat also caused dysfunction of the beta cell? The twin cycle hypothesis applied Occam’s razor (Fig 1).8 The hypothesis could easily be tested by a clinical study, and the COUNTERacting the Pancreatic inhibition Of INsulin secretion by Triglyceride (Counterpoint) study was launched.9

Fig 1.
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Fig 1.

The twin cycle hypothesis: during long-term intake of more calories than are expended each day, excess carbohydrate must undergo de novo lipogenesis, which particularly promotes fat accumulation in the liver. As insulin stimulates de novo lipogenesis, people with insulin resistance (determined by family or lifestyle factors) will accumulate liver fat more readily than others due to the higher plasma insulin levels. The increased liver fat will cause relative resistance to insulin-suppression of hepatic glucose production. Over many years a modest increase in fasting plasma glucose level will cause increased basal insulin secretion rates as a homeostatic response. The consequent hyperinsulinemia will increase further the conversion of excess calories into liver fat. A vicious cycle of hyperinsulinemia and inadequate suppression of hepatic glucose production becomes established. Fatty liver leads to increased export of very low density lipoprotein (VLDL) triacylglycerol which will increase fat delivery to all tissues including the islets. Excess fatty acid availability in the pancreatic islet impairs the acute insulin secretion in response to ingested food, and at a certain level of fatty acid exposure, dedifferentiation of the beta cell will occur with post-prandial hyperglycaemia. The hyperglycaemia will further increase insulin secretion rates, with secondary increase of hepatic lipogenesis, spinning the liver cycle faster and driving on the pancreas cycle. Eventually the fatty acid and glucose inhibitory effects on the islets reach a trigger level for dedifferentiation, leading to a relatively sudden onset of clinical diabetes. Figure adapted with permission from R Taylor.8

It was powered to detect a significant fall in fasting plasma glucose levels in a small group size (n=11). To test the underlying mechanisms, new methodology was developed to measure fat within the substance of the pancreas using advanced magnetic resonance techniques. The results were clear-cut: individuals with very ordinary type 2 diabetes (up to 4 years duration) regained absolutely normal fasting glucose levels within 7 days of commencing a very low calorie diet. This was despite stopping metformin therapy on day one of the diet. Liver fat levels dropped by 30% and liver insulin sensitivity returned to normal in the first 7 days, explaining the change in fasting plasma glucose. However, the change in insulin secretion followed a different time course, gradually improving to normal over 8 weeks. The main data from Counterpoint are illustrated in Fig 2.

Fig 2.
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Fig 2.

Data from Counterpoint showing (a) plasma glucose, (b) hepatic triglyceride content, (c) hepatic insulin sensitivity, (d) pancreas triglyceride content and (e) first phase insulin response. Data are shown as mean ±standard error, for diabetic subjects (filled circles) and measured at a single time point for a weight matched non-diabetic control group. Figures reproduced with permission from Lim et al.9

Is remission of diabetes durable?

It was clearly necessary to determine whether the reversal of underlying pathophysiology and resulting normoglycaemia would persist in the longer term. The basic requirement to achieve non-diabetic glucose control was weight loss of 15 kg. Although this may seem unattainable, a pragmatic approach to permit success during everyday life had been developed in order to carry out the Counterpoint study.9 To answer the question of durability, it was necessary to optimise the transition from the 8 week very low calorie diet to a way of eating which would maximise the chance of maintaining constant weight long term. In the COUNTERacting BetA cell failure by Long term Action to Normalize Calorie intakE (Counterbalance) study, a stepped food reintroduction guided the return to normal foodstuffs with intensive education.10 In this larger group of 30 people, similar weight loss was attained, and in those returning to non-diabetic glucose control (notably those with shorter duration of diabetes) there was zero weight regain by 6 months. The improvement in liver fat, pancreas fat and first phase insulin secretion remained constant and consequently non-diabetic levels of HbA1c were maintained during this period.

The encouraging results from Counterbalance have been extended by the randomised Diabetes REmission Clinical Trial (DiRECT).11 This large study was conducted by primary care nurses, or dietitians if available, and the intervention consisted of a structured 8 hours training in how to achieve the necessary weight loss and prevent weight regain. At 12 months, 24% achieved weight loss of more than 15 kg in the intervention group. 46% of the intervention group had non-diabetic HbA1c off all antihyperglycaemic agents. The underlying changes in intra-organ fat remained constant in those achieving remission (Fig 3). Remission primarily depended upon degree of weight loss, with achievement increasing steadily from (7%) with only 0–5 kg weight loss to 86% who lost 15 kg or more. The accompanying improvement in vitality was much appreciated by the participants, as was the escape from the burden of tablets to swallow daily.

Fig 3.
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Fig 3.

Data from DiRECT showing (a) hepatic triglyceride, (b) total plasma triglycerides, (c) hepatic VLDL1-TG production, (d) intrapancreatic triglyceride, (e) fasting plasma VLDL1-TG and (f) fasting plasma insulin. Time points are at baseline, post weight loss (5 months), and 12 months. Responders (those achieving non-diabetic glucose control; n=40) are shown as a solid line, and non-responders (those remaining in the diabetic range of HbA1c or plasma glucose) as a dotted mid green line. Those randomised to control (continuation of best practice by current guidelines) are shown as a dotted light green line. Figure reproduced with permission from Taylor et al.18

**p<0.01 vs. baseline, ***p<0.0001 vs. baseline (responders)

††p<0.01 vs. baseline, †††p<0.0001 vs. baseline (non-responders)

#p<0.05 vs. 5 months (responders); ‡p<0.05 vs. 5 months (non-responders); ‡‡p<0.01 vs. 5 months (non-responders)

Substantial weight loss achieved by any means can bring about remission of type 2 diabetes, and this has been observed most comprehensively in the Swedish obesity study.12 The belief about glucose lowering effects are due to GLP-1 changes after surgery rather than simple release from fat-induced beta cell suppression have been shown to be incorrect.13,14

It is important to note in passing that all anti-hypertensive agents were also withdrawn on day one of the low calorie diet in order to avoid postural hypotension observed in Counterpoint and Counterbalance. The methodology can clearly be applied to other conditions which would be benefitted by substantial weight loss. The main ingredients of successful weight loss, apart from the use of a planned, short period of low calorie intake, were motivation on the part of the individual to achieve their goal and support from family and friends. The nutritional approach to avoiding weight regain has recently been summarised.15 Increase in exercise during the weight loss phase was discouraged as this tends to be accompanied by compensatory eating. This phenomenon explains why a portion of people fail to lose weight under conventional care.16 However, a steady increase in physical activity was strongly encouraged during weight maintenance. Recognition of this one-two approach for the very different phases of weight loss and weight maintenance is crucial.

The pathophysiological basis of diabetes reversal

The hypothesis-driven design of the Counterpoint study revealed surprisingly high liver fat in people with type 2 diabetes and a dramatic fall to normal on weight loss. This permitted a decrease in intra-pancreatic fat because of decreased export of very low density lipoprotein triglyceride from the liver and the return of normal first phase insulin response. It was possible to describe the new understanding of the aetiology of type 2 diabetes on the basis of Counterpoint, and the response of people with diabetes simply provided with information on how to reverse their condition.17 Counterbalance and DiRECT both extended these findings. Especially in DiRECT, the extent of the intra-organ fat accumulation in ordinary type 2 diabetes was underscored. In the intervention group, liver fat fell from 16.0% ± 1.3% to 3.1% ± 0.5% and pancreas fat from 8.7% ± 0.4% to 7.8% ± 0.4% (Fig 3a).18 The importance of duration of type 2 diabetes since diagnosis was clear from the Counterbalance dataset, with 60% remission in those with duration <4 years, compared with 21% with duration >8 years.14 Even within the DiRECT study group, which only included people within the first 6 years after diagnosis of type 2 diabetes, those achieving non-diabetic levels of glucose control had a slightly but significantly shorter duration.18

The predictions of the twin cycle hypothesis have been confirmed, although the cellular basis for beta cell recovery could not be determined by the in vivo methodology employed. Independently, insight has been gained into the biology of return of insulin secretory capacity after decrease in exposure of beta cell to deleterious levels of triglyceride. Chronic in vitro exposure of beta cells to triglyceride or fatty acids decreases ability to respond to an acute increase in glucose levels19 and the basic concept that fat could impair beta cell function was far from new.20 Relatively low concentrations of saturated fatty acids can cause ultrastructural damage.21 This endoplasmic reticulum stress had been recognised in in vivo studies of type 2 diabetes.22,23 The added stress of raised plasma glucose is likely to exacerbate the metabolic insult once hyperglycaemia is established.24 Loss of specialised beta cell function due to dedifferentiation is now recognised as the most likely mechanism underlying type 2 diabetes.25–27 The old histology studies were certain to report apparently decreased numbers of beta cells as they relied upon insulin immunostaining, and the cells had stopped producing insulin although were still alive. Redifferentiation is permitted by removal of fat from within the pancreas coupled with lower delivery from plasma triglyceride. It is possible to tie in the histological and cell biological processes with observations during clinical reversal of the disease process.28 The new understanding of the mechanisms underlying type 2 diabetes fits well with several studies of significant weight loss in type 2 diabetes.29,30

It is important to recognise the internationally accepted threshold for diagnosis of diabetes (HbA1c >48 mmol/mol or 6.5%) and that a person has attained the state of post-diabetes if persistently below this level off all anti-diabetic agents.31 Post-diabetes is very different to pre-diabetes even though both may share similar glucose levels. The former is characterised by lower plasma lipids and lower blood pressure but the latter by high plasma lipids and blood pressure. In terms of 10 year vascular risk using QRISK, an average person with type 2 diabetes decreases from 23% to 7%, with heart age for a group with average age 55 years decreasing from 71 to 56 years.32 Whereas pre-diabetes is unpredictably progressive, post-diabetes will remain constant long term providing weight remains steady and, predictably, reverts to type 2 diabetes if weight returns to the previous level.

Further questions

Publication of the Counterpoint study in 2011 elicited a major influx of enquiries from people with type 2 diabetes, and ‘how to do it?’ information was placed on a website.33 Subsequently, many individuals reported upon their own experience and 77 provided sufficient information to analyse.34 The majority were able to achieve normal glucose control having stopped their oral hypoglycaemic agents. Half of the group achieved this without medical help and in some cases against medical advice. Some individuals have established self-help networks and have placed their observations on the internet. One of the advantages of the information age is that doctors can listen directly to the comments of many people with a given condition.

Acceptance of the change of paradigm for type 2 diabetes by doctors and scientists was necessarily cautious in the early years after Counterpoint (2011), but especially following publication of DiRECT in 2017, the potential reversibility of type 2 diabetes became widely accepted.35 Recruitment for this study was rapidly over-subscribed, illustrating very well that health care professionals have underestimated the intense dislike of type 2 diabetes felt by sufferers. This became evident from the James Lind Alliance large scale survey of people with diabetes which showed their number one research priority to be ‘Can type 2 diabetes be reversed and how can this best be achieved?’.32

A possible escape route from the condition is avidly accepted by many, to the surprise of their healthcare professionals who have been used to failure in conventional weight loss programmes. Reasons commonly cited for the keenness to try to regain health include removing the pejorative label of being ‘diabetic’, constant tablet taking and fear of complications. The principle difficulty for long term remission of type 2 diabetes is that of maintaining weight loss in the face of the slings and arrows of everyday life. The commonest pattern of weight regain in the first year of DiRECT was steady weight followed by rapid regain as a consequence of some major life event for an individual. The second year results of DiRECT will be available early in 2019, and this should provide further hard information about sustainability in this primary care population.

Several thousand emails have been received since publication of the Counterpoint study, and the most emotionally charged have come from people with type 2 diabetes but ‘normal’ body mass index (BMI) who were told by their doctor or nurse that it would be dangerous or unhealthy to lose weight. Some reported that they had lost weight despite the advice and had reversed their type 2 diabetes.34 The curious belief that individuals can be classified on the basis of an arbitrary cut off derived from population statistics is prevalent, even though a glance down any high street shows that people come in different size and shapes. For instance, it may be unwise to inform an elite rugby player that they are ‘obese’. In the same way, an individual with a body type with a healthy BMI of, say, 20 may run into metabolic problems if it creeps up to 24 kg/m2. 10% of people with type 2 diabetes happen to have a BMI less than 25 kg/m2. In the nurses’ health study there was a four-fold increase in prevalence of type 2 diabetes in women with a BMI of 23–25 compared with those who remained at less than 22 kg/m2.36 They had simply acquired more fat than they personally could cope with, and this has been described as exceeding their personal fat threshold.37 Beyond the level of the individual, some ethnic groups tend to have lesser capacity to store fat safely in the subcutaneous compartment, leading to excessive accumulation in the liver and then pancreas. The personal fat threshold concept is immediately understandable by patients as a way of explaining their condition and the way forward. As a hypothesis it requires experimental verification, and a study is in progress.

The question remains of why some individuals have beta cells susceptible to increased exposure to fatty acids. Many people have fatty liver disease and raised plasma triglyceride, but only a proportion of these go on to develop type 2 diabetes. Detailed genetic studies are required to define the basis of the evident degrees of susceptibility in different individuals. This should not be allowed to distract from the main point demonstrated in the studies discussed above: if a person has true type 2 diabetes, then they have more fat than their beta cells can tolerate.

Summary

Type 2 diabetes is a simple condition of having acquired more fat than the individual’s body can cope with. Excess fat has accumulated in liver and pancreas and the individual’s beta cells are susceptible to fat induced dedifferentiation. In a high proportion of those with short duration diabetes a robust and practical means has been developed to achieve or re-establish non-diabetic glucose control long term.

Acknowledgements

The research work of Drs Ee Lin Lim, Sarah Steven, Carl Peters, Ahmad Al-Mrabeh, Kieren Hollingsworth and Sviatlana Zhyzhneuskaya (all of the Magnetic Resonance Centre, Newcastle University) is gratefully acknowledged. DiRECT was carried out in partnership with Professor Michael Lean and the DiRECT team.

  • © Royal College of Physicians 2019. All rights reserved.

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Calorie restriction for long-term remission of type 2 diabetes
Roy Taylor
Clinical Medicine Jan 2019, 19 (1) 37-42; DOI: 10.7861/clinmedicine.19-1-37

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Calorie restriction for long-term remission of type 2 diabetes
Roy Taylor
Clinical Medicine Jan 2019, 19 (1) 37-42; DOI: 10.7861/clinmedicine.19-1-37
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    • ABSTRACT
    • Established beliefs about type 2 diabetes
    • The twin cycle hypothesis
    • Is remission of diabetes durable?
    • The pathophysiological basis of diabetes reversal
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