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Increasing the protein quantity in a meal results in dose‐dependent effects on postprandial glucose levels in individuals with Type 1 diabetes mellitus
Author(s) -
Paterson M. A.,
Smart C. E. M.,
Lopez P. E.,
Howley P.,
McElduff P.,
Attia J.,
Morbey C.,
King B. R.
Publication year - 2017
Publication title -
diabetic medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.474
H-Index - 145
eISSN - 1464-5491
pISSN - 0742-3071
DOI - 10.1111/dme.13347
Subject(s) - postprandial , medicine , carbohydrate , meal , endocrinology , diabetes mellitus , insulin , type 2 diabetes , zoology , biology
Aim To determine the glycaemic impact of increasing protein quantities when consumed with consistent amounts of carbohydrate in individuals with Type 1 diabetes on intensive insulin therapy. Methods Participants with Type 1 diabetes [aged 10–40 years, HbA 1c ≤ 64 mmol/mol (8%), BMI ≤ 91st percentile] received a 30‐g carbohydrate (negligible fat) test drink daily over 5 days in randomized order. Protein (whey isolate 0 g/kg carbohydrate, 0 g/kg lipid) was added in amounts of 0 (control), 12.5, 25, 50 and 75 g. A standardized dose of insulin was given for the carbohydrate. Postprandial glycaemia was assessed by 5 h of continuous glucose monitoring. Results Data were collected from 27 participants (15 male). A dose–response relationship was found with increasing amount of protein. A significant negative relationship between protein dose and mean excursion was seen at the 30‐ and 60‐min time points ( P = 0.007 and P = 0.002, respectively). No significant relationship was seen at the 90‐ and 120‐min time points. Thereafter, the dose–response relationship inverted, such that there was a significant positive relationship for each of the 150–300‐min time points ( P < 0.004). Mean glycaemic excursions were significantly greater for all protein‐added test drinks from 150 to 300 min ( P < 0.005) with the 75‐g protein load, resulting in a mean excursion that was 5 mmol/l higher when compared with the control test drink ( P < 0.001). Conclusions Increasing protein quantity in a low‐fat meal containing consistent amounts of carbohydrate decreases glucose excursions in the early (0–60‐min) postprandial period and then increases in the later postprandial period in a dose‐dependent manner.