Eating vs Skipping Breakfast on Postprandial Hyperglycemia After Lunch and Dinner in T2D

Background or Rationale Studies analyzing the postprandial glycemic response have shown that glucose tolerance display a clear diurnal variation with a progressive decline in carbohydrate tolerance toward the evening hours with more prolonged and higher postprandial glycemic response in the evening than in the morning.

Meal timing patterns, on the other hand, exerts strong entraining influence on clock gene regulation of hormones and enzymes i.e. insulin, GLP-1, involved in glucose metabolism and postprandial glycemia disrupting the diurnal variation of postprandial glycemia (PPG). It suggests the extent of post-prandial rise in plasma glucose depends not only upon the quantity and nature of food ingested, and on the clock gene regulated circadian hormonal rhythms, it also depends upon the metabolic state immediately prior to eating. Indeed, meal schedule non-aligned with the clock gene circadian rhythms, such as skipping breakfast and/or overeating at evening, has been associated, in T2D individuals, with higher BMI, visceral adiposity, hyperlipidemia, higher HbA1c and increased PPG despite same caloric intake. The absence of breakfast has been associated in obese and T2D subjects with increased plasma levels of free fatty acids (FFA) along the morning until the lunch, Chronic and acute increase of FFA plasma levels, has been reported as triggering factor of insulin resistance, by inhibition of insulin mediated stimulated glucose uptake and/or phosphorylation which develops 3-4 hours after raising of plasma FFA and by inhibition of glycogen synthase, the rate limiting enzyme of glycogen synthesis, which develops 4-6 hours after the rise of FFA. However the effect of eating vs skipping breakfast on postprandial glucose response after identical lunch and dinner has not been explored. It is therefore important to explore the influence of eating versus skipping breakfast on postprandial glucose, after lunch and dinner in T2D individuals. Concomitantly the investigators will assess after lunch and dinner plasma insulin, GLP-1 and FFA response after lunch and dinner in T2D individuals.

Expected results: The investigators expect that compared skipping breakfast condition, the eating breakfast condition will reduce postprandial plasma glucose and FFA response after lunch and dinner, while plasma insulin, C-peptide and GLP-1 after lunch and dinner will be enhanced Relevance of the study: If our hypothesis is confirmed it may be may be of practical benefit to people with Type 2 diabetes, a condition in which the reduction of PPHG at lunch and at dinner may result in improved HbA1c and might be also preventive of the risk for CVD Objectives: With this aim will study T2D patients in randomized crossover design to consume in two separate days, either 3 standard isocaloric meals: Yes Breakfast condition (YesB) or omit breakfast: no breakfast condition (NoB) and consume only lunch and dinner with the same caloric content.

Methods and Study Design: The YesB intervention will consist on three identical meals coating 700 Kcal each: breakfast at 8:00, lunch at 13:00 and dinner at 19:00. The NoB intervention the breakfast will be omitted and the subject continue fasting until lunch. Then the participants will consume identical 700 kcal Lunch at 13:00 and 700 Kcal dinners at 19:00. The investigators will assess plasma glucose, insulin, C-peptide, GLP-1 and FFA with blood samples collected every 30 min up to 180 min after breakfast, lunch and dinner and at the same time point the blood samples will be collected after 8:00 when the breakfast will be omitted.