The striker has not scored in the Premier League for more than 14 months, a run of 25 matches.
Stoke manager Mark Hughes showed enough belief in the 23-year-old to pay West Brom £12million for him at the end of January, fully aware he may need to be patient.
After an eight-week ban after failing a dope test, Berahino was overweight when he arrived in the Potteries, but has lost 13lbs in three months as he tries to end his frustrations in front of goal.
Berahino said: “The way my body is, when I’m playing, I trim down. When I’m not playing, it puts on weight. I’ve got to blame my family for the genes they gave me.
“It’s not junk food. It’s just that I put on weight easily if I don’t move. If I don’t do exercise, my weight just goes up. That’s what happened at West Brom.
“It’s not worrying me at all that I haven’t scored. I’d be worried if I wasn’t getting any chances.”
While Berahino could not score on Saturday neither could West Ham, thanks to a fine display by Jack Butland in his first home league game after more than a year out with a broken ankle.
West Ham, just about safe after a run of four games without defeat, want to give their fans something to cheer with a bit of revenge over Tottenham at the London Stadium on Friday.
They fell to an agonising 3-2 defeat at White Hart Lane in November, and keeper Adrian believes it is time for payback.
“At Tottenham, we played very well but they had the luck to score at the end. We are a different West Ham.”
STOKE (4-3-3): Butland 8; Johnson 7, Shawcross 7, Martins Indi 7, Muniesa 6; Allen 6 (Crouch 70, 6), Whelan 6 (Adam 80), Cameron 6; Shaqiri 6, Berahino 6, Arnautovic 6. Booked: Muniesa. NEXT UP: Arsenal (h) Sat, PL.
WEST HAM (3-5-2): Adrian 7; Fonte 7, Reid 7, Collins 7; Fernandes 6, Kouyate 7, Nordtveit 6, Lanzini 7, Masuaku 6 (Cresswell 46, 6); Ayew 6 (Noble 67, 6), Calleri 6 (Snodgrass 80). NEXT UP: Tottenham (h) Fri, PL.
Referee: Lee Probert (Wiltshire).
Stoke News: Saido Berahino opens up about weight loss as he looks to rediscover form | Football | Sport