A weight gain prevention strategy showing merit is a small change approach (increase energy expenditure and/or decrease energy intake by 100–200 kcal/day). Studies have tested a small change approach in intensive interventions involving multiple contacts, unsuitable for delivery at scale. The aim here was to assess the feasibility and acceptability of a remote small change weight gain prevention intervention. A randomised controlled trial of 122 participants was conducted. The intervention was a remote 12-week small change weight gain prevention programme (targeting dietary and/or physical activity behaviours). The comparator group received a healthy lifestyle leaflet. Data were collected at baseline and 12-weeks. The primary outcome was the feasibility and acceptability, assessed against three stop–go traffic light criteria: retention, number of participants randomised per month and adherence to a small change approach. Participants’ opinions of a small change approach and weight change were also measured. The traffic light stop–go criteria results were green for recruitment (122 participants recruited in three months) and retention (91%) and red for intervention adherence. Most participants (62%) found a small change approach helpful for weight management and the mean difference in weight was − 1.1 kg (95% CI − 1.7, − 0.4), favouring the intervention group. Excluding intervention adherence, the trial was feasible and acceptable to participants. Despite adherence being lower than expected, participants found a small change approach useful for weight management and gained less weight than comparators. With refinement to increase intervention adherence, progress to an effectiveness trial is warranted.

ISRCTN18309466: 12/04/2022 (retrospectively registered).

一种显示出优点的体重增加预防策略是一种小改变方法（增加能量消耗和/或减少能量摄入 100-200 kcal/天）。研究测试了涉及多次接触的密集干预措施的小改变方法，不适合大规模实施。这里的目的是评估远程小变化体重增加预防干预措施的可行性和可接受性。对 122 名参与者进行了一项随机对照试验。干预措施是一项为期 12 周的远程小幅体重增加预防计划（针对饮食和/或身体活动行为）。对照组收到了健康生活方式传单。数据在基线和 12 周时收集。主要结果是可行性和可接受性，根据三个走走停停的红绿灯标准进行评估：保留率、每月随机分配的参与者数量以及对小改变方法的遵守。还测量了参与者对小改变方法和体重变化的看法。红绿灯走走停停标准结果为绿色，表示招募（三个月内招募了 122 名参与者）和保留率（91%），红色表示干预依从性。大多数参与者 (62%) 发现小幅改变方法有助于体重管理，体重平均差异为 − 1.1 kg (95% CI − 1.7, − 0.4)，这对干预组有利。排除干预依从性，该试验是可行的并且为参与者所接受。尽管坚持程度低于预期，但参与者发现一个小的改变方法对体重管理很有用，并且比对照组增加的体重更少。通过改进以提高干预依从性，有必要取得有效性试验的进展。

ISRCTN18309466：2022 年 12 月 4 日（追溯注册）。